Complex sentence: Lawrence and Frieda returned to Britain in 1913 for a short visit, during which they encountered and befriended critic John Middleton Murry and New Zealand-born short story writer Katherine Mansfield.
Split into simpler sentences: Lawrence and Frieda returned to Britain in 1913 for a short visit. At this time, he now encountered and befriended critic John Middleton Murry and New Zealand-born short story writer Katherine Mansfield.