Complex sentence: When recording finished, Banks expressed some concern that the album would be too "heavy" and "difficult" for people to get into at first as the three tracks recorded that were left off were described by Banks as "quite simple".
Split into simpler sentences: When recording finished, Banks was a little concerned that the album was a "heavy" and "difficult" one for people to get into at first. The three tracks recorded that were left off were described by Banks as "quite simple".