Question

HE LOST HIS DOG.HE FELT LONELY ( CHANGE INTO SIMPLE SEBTENCE)​

Answer 1

He felt lonely for his lost dog.

Answer 2

Simple sentence of HE LOST HIS DOG.HE FELT LONELY will be that As he lost his dog, he felt lonely.

Explanation:

When we talk about the simple sentence, then we can say that a simple sentence has only one main clause. It does not have any subordinate clauses.

Whereas the complex sentence has one main clause and one or more subordinate clauses. A complex sentence can be converted into a simple sentence by just contracting a subordinate clause into a word or phrase.

So in this way we can convert  a complex sentence into a simple sentence.