Original sentence: In 1973 they were joined by Hipgnosis's Peter "Sleazy" Christopherson.One of the most significant outcomes of these exchanges was Burroughs's introduction of P-Orridge to Brion Gysin
Edited sentence: In 1973 they were joined by Hipgnosis' Peter "Sleazy" Christopherson.One of the most significant outcomes of these exchanges was Burroughs' introduction of P-Orridge to Brion Gysin