Complex sentence: Archie Bleyer at Cadence had previously told Williams that "Moon River" would not be a hit but the Columbia producers encouraged Andy to record the song along with eleven other movie themes for an album.
Split into simpler sentences: Archie Bleyer at Cadence had previously told Williams that "Moon River" would not be a hit. But the Columbia Producers encouraged Andy to record the song along with eleven other movie themes for an album.