Question

Rina has brother who can help her (make it simple)

Answer 1

Writing simple sentences in English is a very easy task in the English language.

Here we use an adjective to describe the subject of the sentence and most importantly, we cannot use articles before an adjective.

Sentence: Rina has a brother who can help her

Simple sentence: Brother of Rina is helpful.

Answer 2

Hi,

Here is your answer,

Question = Rina has brother who can help her (make it simple) ?

Answer = Brother of Rina is helpful.

Hope it helps you !