Complex sentence: Bill finds her on the day of her wedding rehearsal and pretends to give her his blessing; moments later, he leads the Vipers in massacring the wedding party in the chapel and shooting Kiddo in the head, putting her in a coma.
Split into simpler sentences: Bill finds her on the day of her wedding rehearsal and pretends to give her his blessing. Moments later, he leads the Vipers in massacring the wedding party in the chapel, and shoots Kiddo in the head, putting her in a coma.