Complex sentence: Dann, 144 Boyd rang Drake (whose only words during the conversation were "Oh, uh, OK") and arranged a recording session for the following day, on the condition that Cale be alowed play on the tracks.
Split into simpler sentences: Dann, 144 Boyd phoned Drake, and was given concent-boyd claims Drake's only words during the conversation were "Oh, uh, OK". He arranged a recording session for the following day, on the condition that Cale would be allowed to add accompaniment to the tracks.