Answer:
Compound sentence
Step-by-step explanation:
A compound sentence is a sentence consisting of two or more independent clauses with related ideas that are joined by a semicolon or coordinating conjunction like and, but, so, for, nor, or, yet. As for independent clauses, they are groups of words containing a subject and a verb and expressing a complete thought or idea.
The sentence provided has two independent clauses: 1) He steeled his nerve, 2) he walked into the police station to confess that are connected with “and.” Thus, it is a compound sentence.