Complex sentence: He attended the Berkshire Music Center, Tanglewood, where he won an ASCAP Fellowship to study composition with Lukas Foss and Bruno Maderna, and where Gunther Schuller performed his Drafts (1971) for chamber ensemble by the Berkshire Music Center ensemble.
Split into simpler sentences: He attended the Berkshire Music Center, Tanglewood, where he won an ASCAP Fellowship to study composition with Lukas Foss and Bruno Maderna. While at Berskire, Gunther Schuller performed his "Drafts" (1971) for chamber ensemble with the Berkshire Music Center ensemble.