The correct answer is He lies down on his side
This is a bit making it simple however since he had to do a bunch of things before he was able to do this. He had to clear a piece of a forest and to lie on his side in a special manner in order to see the palace and the beautiful rooms that he later described.
Joining two simple sentences into another simple sentence
Sentence synthesis means combining two or more simple sentences into one new sentence. ...
By using infinitives.
We can combine these two sentences into one using a to-infinitive.
By using a noun or phrase in apposition.
By using a participle.
We can combine two simple sentences into one by using a present or past participle
I dont know what you mean by that btw