Answer:
Your answer would be that the sentence can be fused in the following way: several poets have taken inspiration from Walt Whitman's style; therefore, (...).
Step-by-step explanation:
When you have a conjunctive adverb linking two independent clauses, you should use a semicolon. In the sentence, you have two independent clauses connected by the conjunctive adverb therefore (1 & 2), so a semicolon should be placed before this word. What is more, a comma is placed after it because the conjunctive adverb is in inital position in the sentence.
1) Several poets have taken inspiration from Walt Whitman's style
therefore
2) He's known in literary circles across the world.