Pls also mention how did you get the answer.Thank you

Dear Student

1. He confessed the crime that he had committed.
2. He bought the factory that belonged to his uncle.
3. In order to pass the test, he worked very hard.
4. During his childhood days, Lincoln did not go to school.
5. The hunter saw the lion and therefore, he climbed up the tree.

Rule for changing simple sentences into complex sentences : Simply expand a word or phrase in the simple sentence into a subordinate clause. That is how we have arrived at all the above answers.

1. crime was expanded into crime that he had committed.
2. uncle's factory becomes the factory that belonged to his uncle.
3. to pass the test changed into in order to pass the test.
4. In his childhood was expanded into during his childhood days.
5. On seeing the lion was changed into the hunter saw the lion.

Regards.