Complex sentence: On his return to London in 1969, Denys continued to be interested in making films and in record production and he set up a company called Lucifer films Ltd. with Naomi Zack who he'd met at Columbia University.
Split into simpler sentences: On his return to London in 1969, Denys continued to be interested in making films and in record production. He set up a company called Lucifer films Ltd. with Naomi Zack who he'd met at Columbia University.