We can infer from aristotles descriptions that aesop was a freed slave, but little else is known about him? what type of sentence

This is a compound-complex sentence.
It means that it contains at least two independent clauses, and at least one dependent clause. As you can see here, there are two independent clauses:
1. We can infer from Aristotle's descriptions
2. but little else is known about him
And there is one dependent clause - that Aesop was a freed slave.

The answer is