Complex sentence: Mrs. Gustafson (plaintiff) a California resident and her husband, was visiting relatives in Salem, Oregon when Gustafson and her mother-in-law visited the local Rite Aid (defendant).
Split into simpler sentences: Mrs. Gustafson (plaintiff) a California resident and her husband, was visiting relatives in Salem, Oregon. The plaintiff and her mother-in-law went shopping at the local Rite Aid (defendant).