Question

add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation.
musician david bowie was known for his numerous alter egos however, his character ziggy stardust, a rock star alien portrayed in bowies hit single \starman,\ has enjoyed more enduring popularity than the rest.

Explanation:

The two independent clauses "Musician David Bowie was known for his numerous alter egos" and "however, his character Ziggy Stardust... has enjoyed more enduring popularity than the rest" are separated by the conjunctive adverb "however". When a conjunctive adverb is used to join two independent clauses, a semicolon should be placed before the conjunctive adverb.

Answer:

Musician David Bowie was known for his numerous alter egos; however, his character Ziggy Stardust, a rock star alien portrayed in Bowie's hit single "Starman," has enjoyed more enduring popularity than the rest.