Original sentence: As a pioneer of the American thrash metal movement, Megadeth rose to international fame in the 1980s, but were plagued by constant lineup changes, due in part to Mustaine's notorious substance abuse problems
Edited sentence: As a pioneer of the American thrash metal movement, Megadeth rose to international fame in the 1980s, but were plagued by constant lineup changes, due in part to Mustaine's notorious substance abuse problems and ego