Complex sentence: McCartney recalls using Lennon's Menlove Avenue home as the writing base for the song; this was rare as Lennon's Aunt Mimi, whom he still lived with at the time, was disapproving of the Beatles.
Split into simpler sentences: McCartney recalls using Lennon's Menlove Avenue home as the writing base for the song. This was rare, as Lennon's Aunt Mimi, whom he still lived with at the time, was disapproving of the Beatles.