Complex sentence: Marinelli's recording and movie career began as a teenager playing synthesizers, live radio broadcasts of Classical works with a group he co-founded, called the Synners, caught the attention of film producers and composers and various invitations to perform, including on Michael Jackson's Thriller.
Split into simpler sentences: Marinelli's recording and movie career began as a teenager playing synthesizers. Live radio broadcasts of Classical works with a group he co-founded, called the Synners, caught the attention of film producers and composers and various invitations to perform, including on Michael Jackson's Thriller.