Complex sentence: After several weeks of rehearsals all was well acoustically, however when the band went electric it did not work out as well as Donovan hoped, rather than rehearse the new electric approach, Donovan had a change of heart and went to the U.S. alone.
Split into simpler sentences: After several weeks of rehearsals all was well acoustically, however when the band went electric it did not work out as well as Donovan hoped. Rather than rehearse the new electric approach, Donovan had a change of heart and went to the U.S. alone.