Complex sentence: George Martin was an Honorary fellow of the Zoological Society of London and the owners of the London Zoo, thought that it might be good publicity for the zoo to have The Beatles pose outside the insect house for the cover photography of the album.
Split into simpler sentences: George Martin was an honorary fellow of the Zoological Society of London, which owns the London Zoo. Martin thought that it might be good publicity for the zoo to have The Beatles pose outside the insect house for the cover photography of the album.