Complex sentence: Later in the party, Gabrielle accidentally spills her drink all over Adam, and she's cleaning it off of him when Katherine finally has enough and confronts Gabrielle in front of everyone, citing her reputation.
Split into simpler sentences: Later in the party, Gabrielle accidentally spills her drink all over Adam. As she's cleaning it off of him, Katherine finally has enough and confronts Gabrielle in front of everyone, citing her reputation.