Original: Later in 1465 Busnois moved to Poitiers, where he not only became "maîtrise" (master of the choirboys), but managed to attract a flood of talented singers from the entire region; by this time his reputation as singing teacher, scholar, and composer seems to have spread widely.
Simplified: Later in 1465 Busnois moved to Poitiers, where he not only became "maîtrise" (master of the choirboys), but managed to get lots of good singers from the region.