Answer:
Simple sentence
Step-by-step explanation:
Independent clauses are clauses that can stand alone as a sentence. Every sentence must contain a subject and a predicate and express a complete thought. Independent clauses contain all of these elements, while dependent clauses don't, which is why they can't stand alone.
A simple sentence is a sentence that consists of one independent clause. The given sentence is an example of this type of sentence. The subject is man and the predicate is struggles hard to earn his living. An independent clause has one subject-predicate pair. This is the case here, which means that this sentence consists of one independent clause. This makes it a simple sentence.
Compound sentences are sentences that consist of at least two independent clauses.
Complex sentences are sentences that consist of one independent clause and at least one dependent clause.