Complex sentence: She did this with the intention of taking vengeance on Selene for the murders she had committed, particularly that of nightclub owner Nicholas Damiano, who had previously taken Rachel into his home after Selene attacked her.
Split into simpler sentences: She did this with the intention of taking vengeance on Selene for the murders she had committed, particularly that of nightclub owner, Nicholas Damiano. Nicholas had previously taken Rachel into his home after Selene attacked her.