Complex sentence: She repeatedly toys with the idea of seducing Ross (who knows he would be unable to resist), with the sole apparent intention of hurting Sorcha, but has been in love with Ross's best friend Christian Forde since she was 15.
Split into simpler sentences: She repeatedly toys with the idea of seducing Ross (who knows he would be unable to resist), with the sole apparent intention of hurting Sorcha. Erika has been in love with Ross's best friend Christian Forde since she was 15.