Complex sentence: The two shared a fascination with historic recording techniques and equipment, and they studied the 2006 book "Recording The Beatles" together, noting an interest in the knowledge of recording gear by engineers and technicians for English rock band The Beatles.
Split into simpler sentences: The two shared a fascination with historic recording techniques and equipment. They also studied the 2006 book "Recording The Beatles" together and had an interest in the knowledge of recording gear by engineers and technicians for English rock band The Beatles.