Complex sentence: In the 1940s, together with Laurence Olivier and John Burrell, Richardson was the co-director of the Old Vic company, with which his most celebrated roles included Peer Gynt and Falstaff.
Split into simpler sentences: In the 1940s, together with Laurence Olivier and John Burrell, Richardson was the co-director of the Old Vic company. There his most celebrated roles included Peer Gynt and Falstaff.