Complex sentence: Martin, the Beatles long time engineer and producer was weary about going into the studio after the miserable sessions during the Let it Be recording sessions.The Let it Be sessions were handed over to Phil Spector in 1970 and released in April 1970.
Split into simpler sentences: Martin, the Beatles long time engineer and producer was weary about going into the studio after the miserable sessions during the "Let it Be" recording sessions. The "Let it Be" sessions were handed over to Phil Spector in 1970 and released in April 1970.