When Abe had his tonsils removed, he would eat yogurt, ice cream, and jello; he wouldn't eat pizza, hamburgers, or spaghetti, which surprised me since spaghetti is mushy.

Simple
Compound
Complex
Compound-Complex

1 answer

The sentence you provided is a complex sentence.

It contains one independent clause ("he would eat yogurt, ice cream, and jello") and one dependent clause ("when Abe had his tonsils removed"). The other part of the sentence ("which surprised me since spaghetti is mushy") includes another dependent clause introduced by "which."

So, the overall structure includes a main idea with additional information provided by dependent clauses, making it complex.