Sentence 1: Abijit and Ricardo visited clients forsome of their clients to observe their operations in Romania, Azerbaijan and Saudi Arabia.

If possible, they try to get in touch with the business partners of the clients in these countries.

Sentence 2: Ricardo and Abijit say they respect BCC Turkey’s presence in Türkiye.

If any business activity arisesopportunity is available in Türkiye, they wantould like to join the project or bids through BCC Turkey. (?)

Sentence 3: BCC Dutch aims at improving business development activities in Türkiye.

Sentence 5: John says he always prefers to work with BCC Turkey in projects in Türkiye but he can cooperate with BCC Dutch in the overseas projects (outside Turkey)

IfWhen possible/Whenever it was possible, they would try to get in touch with the business partners of their clients in these countries.

'Whenever it was possible' is a more formal alternative

Sentence 2: Ricardo and Abijit say that they respect BCC Turkey’s presence in Tüurkiyey.

Just so you know, although the government of Turkey has changed the country's name to Türkiye, we still refer to it as Turkey.

If any business activity arises in Tüurkiyey, they wantould like to join the project or submit bids through BCC Turkey.

'If' is the start of a conditional statement so you need to use the conditional tense here (e.g. would)

Sentence 3: BCC Dutch aims at improving business development activities in Tüurkiyey.

So they will visit here morepay more visits in the coming months.

Changed this to make it sound more natural.

I suggested that it would be better if they go to visit the potential clients together with our business developer.

Sentence 4: Abijit and Ricardo think SGS will need Rayscan and Ultrasonic tests for the pipelines.

That’s why they want to organize a workshop in Rotterdam and in Ankara for SGS's decision makers in order. They want to show how these equipment work and what kind of advantages the equipments havetheir advantages.

Sentence 5: John says he always prefers to work with BCC Turkey ion projects in Tüurkiyey but he can cooperate with BCC Dutch in theon overseas projects (outside Turkey).

IfWhen possible, they try to get in touch with business partners of the clients in these countries.

Sentence 2: Ricardo and Abijit say they respect BCC Turkey’s presence in Tüurkiyey.

If any business activopportunity arises in Tüurkiyey, they want to join the project or bids through BCC Turkey.

Sentence 3: BCC Dutch aims at improving business development activities in Tüurkiyey.

So, they will visit hereit more in the coming months.

I suggested that it would be better if they go to visited the potential clients together with our business developer.

Sentence 4: Abijit and Ricardo think SGS will need Rayscan and Ultrasonic tests for the pipelines.

That’s why they want to organize a workshop in Rotterdam and in Ankara for SGS's decision makers in order to show how these equipment works and what kind of advantages the equipments haves.

Sentence 5: John says he always prefers to work with BCC Turkey ion projects in Tüurkiyey but he can cooperate with BCC Dutch ion the overseas projects (outside Turkey)