What type of sentence is, although mary isn’t fond of reading, she read harper lee’s
to kill a mockingbird, and she found it fascinating.

The sentence above is a compound- complex sentence.

Explanation:

A compound-complex sentence has at least two independent clauses and at least one dependent clause. The difference between an independent clause and an dependent one is that the former can stand on its own because it represents a complete thought. You can see this in the examples below, the dependent clauses is an ungrammatical sentences when used as an independent clause because it relies on the independent clause to complete its meaning. On the contrary, the independent clauses are grammatical when used alone.

a) *Although Mary isn't fond of reading,

b) She read Harpeer Lee's To Kill A Mockingbird

c) And she found it fascinating

what are your options ?

i would say years or cherry blossoms