Complex sentence: Barry Manilow's 1974 "Mandy" was originally titled "Brandy" but Manilow changed it following the success of the Looking Glass single, so as not to get the two songs confused.
Split into simpler sentences: Barry Manilow's 1974 "Mandy" was originally titled "Brandy". However, Manilow changed it following the success of the Looking Glass single, so as not to get the two songs confused.