Complex sentence: They brought Kathryn McCamant, the architect who popularized the cohousing model in the U.S. to conduct a cohousing workshop in Ann Arbor which spawned a group who met regularly to establish criteria for site selection.
Split into simpler sentences: They brought Kathryn McCamant, the architect who popularized the cohousing model in the U.S. to conduct a cohousing workshop in Ann Arbor. Inspired by her workshop, a group began meeting regularly to establish criteria for site selection.