He is a champion cyclist because he rides miles everyday. is this complex or coumpound-complex

This sentence has one independent clause >> "He is a champion cyclist."

The rest of the sentence is the dependent (subordinate) clause >> "because he rides miles every day."

What kind of sentence has one independent clause and one dependent clause?

a complex

Right.

The sentence "He is a champion cyclist because he rides miles every day" is a complex sentence.

To identify the type of sentence, we need to understand its structure. A complex sentence consists of an independent clause (a group of words that can stand alone as a sentence) and at least one dependent clause (a group of words that cannot stand alone as a sentence).

In this sentence, "He is a champion cyclist" is the independent clause, as it can function as a complete sentence on its own. The phrase "because he rides miles every day" is the dependent clause because it cannot form a complete sentence independently. It relies on the independent clause for meaning.

Therefore, since this sentence contains both an independent and a dependent clause, it falls under the category of a complex sentence.