QUESTION: Fix punctuation: In return the partner countries including developing countries receive a financial contribution that they can invest in developing their own fisheries industry and building up their own fish stocks
ANS: In return, the partner countries (including developing countries) receive a financial contribution that they can invest in developing their own fisheries industry and building up their own fish stocks.

QUESTION: Fix punctuation: I have almost made up my mind to reject the rule of priority in this case would you grudge the trouble to send me your opinion
ANS: I have almost made up my mind to reject the rule of priority in this case; would you grudge the trouble to send me your opinion?

QUESTION: Fix punctuation: When spring approaches the evenings begin to get lighter and it is usually then that most people become tired of lectures
ANS: When spring approaches, the evenings begin to get lighter and it is usually then that most people become tired of lectures.

QUESTION: Fix punctuation: Several rare herbs have survived here as the only place in the world
ANS:
Several rare herbs have survived here, as the only place in the world.