Complex sentence: Editor interview with Carl Giammarese, March, 2008, Carl Giammarese Wikipedia page Severe differences occurred between the Buckinghams and Guercio, particularly the producer's decision to add a (psychedelic) section to the song "Susan".
Split into simpler sentences: Editor interview with Carl Giammarese, March, 2008, Carl Giammarese Wikipedia page Severe differences occurred between the Buckinghams and their producer. The group opposed the producer's decision to add a psychedelic section to the song "Susan".