Based on that passage, I'd say the young man is active because he's jogging, and friendly he smiled in encouragement to elderly men. Nothing in the passage indicates that he is either intelligent or snobbish.
This sentence is a compound sentence as it has two independent clauses joined by a comma.
Explanation:
Simple sentences are made of one independent clause, that is to say, a sentence with a subject, a verb and a predicate.
Compound sentences are made of at least two clauses joined by a comma, colon or conjunction.
Complex sentences are made of an independent clause and at least one dependent clause.
Complex-compound sentences are made of at least two independent clauses and at least one independent clause.
