Question

raman went to the usa to study law. his sister also went to the usa to study law

Answer 1

Two simple sentences are given.  We need to combine them both into a compound sentence.   Here the best suited conjunction is "AND".

Given sentences are :    Raman went to the USA to study law.  His sister also went to the USA to study law.

Answer:    Raman and (also) his sister went to the USA to study law.

Answer 2

Answer:

Raman went to the USA to study law as well as his sister also went to the usa to study law

Explanation:

as well as we use in the place of and