What type of sentence is listed below?

"The system worked, but the books were heavy and slow to read."
A
simple
B
compound
C
complex
D
compound-complex

I suggest that it's simple becoz compound sentences are like this

EX:because the soup was too cold I warmed it in the microwave

and complex

EX:though I prefer drinking coffee I drank tea today.

so it's completely different from ur sentences so ur sentence is a simple one is what I suggest u

our founding fathers introduced the revolutionary idea that each person's desire to pursue their idea of happiness was not self-indulgence, but a necessary driver of a prosperous society. they created a government to defend that right for everyone.

- the heat nearly killed them that first summer.