Complex sentence: The beat for the track "Go With the Flow" begins while DOOM begins to rap "Gas Drawls", however, after the first verse, DOOM instructs him to switch the beat to the "Gas Drawls" and they begin the song again.
Split into simpler sentences: The beat for the track "Go With the Flow" begins while DOOM begins to rap "Gas Drawls". However, after the first verse, DOOM instructs him to switch the beat to the "Gas Drawls" and they begin the song again.