Question

They listened to our request. They solved our difficult problem. (turn into a simple sentence)

Answer 1

after listening to our request,they solved our difficult problem.

Answer 2

The right answer is ‘By listening to our request they solved our difficult problem’.

Here the verb of the first sentence has been changed into gerund and in this way both the sentences are joined in a simple sentence where there is a single verb solved.

The meaning of the sentence is kept unchanged and the sequence of the tense remains the same.