Complex sentence: Harrison was the first Beatle to own or use a moog synthesizer, and he recorded "Under The Mersey Wall" with his Moog at Kinfauns; the track became one side of his "Electronic Sound" album, released in May 1969.
Split into simpler sentences: Harrison was the first Beatle to own or use a Moog synthesizer, and he recorded "Under the Mersey Wall" with his Moog at Kinfauns. The track filled one side of his "Electronic Sound" album, released in May 1969.