In the sentence - Plenty of silicon is found on Earth, but it remains a valuable material for the computer industry. What is the simple subject and predicate?

Answer 1

There are two clauses here, making this a compound sentence.

Clause 1 = Plenty of silicon is found on Earth

Clause 2 = it remains a valuable material for the computer industry.

Now can you see the simple subject and simple verb in each clause?

??

Answer 2

yes, but I'm not sure if the simple predicate in clause 1 is is or is found.