Answer :
Yes, the sentence is a run-on. It can be corrected by adding punctuation or breaking it into two sentences: "Aimée Marcoud, a trapeze artist, performed as Miss Fillis. She retired at the age of fifty-five."
Run-on sentences attempt to combine two independent clauses without the proper punctuation or a coordinating conjunction. For example, the sentence "Aimée Marcoud, a trapeze artist, performed under the name Miss Fillis she retired at the age of fifty-five." is an example of such a sentence. You can either use a period to separate the two clauses into two separate sentences or a semicolon to do it right.
In the revised versions, each clause is given its own thought: "Miss Fillis was the stage name used by trapeze artist Aimée Marcoud. When she was 55 years old, she retired. or "Trapeze performer Aimée Marcoud, who went by the stage name Miss Fillis, retired at the age of 55."
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