Complex sentence: Marietta still hates Boris and continues to arrange for Melodie to marry Randy so she takes her to an outdoor craft market and "accidentally" runs into Randy in which he bought her a silk handkerchief.
Split into simpler sentences: Marietta still hates Boris and continues to arrange for Melodie to marry Randy. She takes her to an outdoor craft market and "accidentally" runs into Randy, who is buying her a silk handkerchief.