Question

请帮我看看这句话有没有语法错误，如果有请帮忙改正

I would like to try out a new food which was told rather disappointing by a friend to determine why it upset her.

Answer 1

I would like to try a new food which is said to be disappointing by my friend so that I can find why it upset her.
或许是这样吧，你不觉得这个句子太冗长了吗，拆开来写比较好，不能只追求长度，明了也是英语写作的一大要点。

Answer 2

I would like to try out a new food that said to be rather disappointing by a friend so that I can determine why it upset her.
但是我觉得你要表达的意思用“determine”不太合适Research或许好些