成功的 in English:

It was a fruitful cooperation.

Our cooperation has proved to be fruitful.

It will be a fruitful year for us.

The research has proved extremely fruitful.

it was fruitful time

We have had a very fruitful dialogue and the report is very constructive.

fruitful meeting

Their stay in Germany for a year was very fruitful.

Their year-long stay in Germany was very fruitful.