Complex sentence: Stott Despoja was elected leader on 6 April 2001, replacing Meg Lees who then mounted a series of public attacks in 2002, culminating in Lees's resignation from the party in July 2002.
Split into simpler sentences: Stott Despoja was elected leader on 6 April 2001, replacing Lees. Deposed leader Lees engaged in a number of public attacks in 2002, culminating in her resignation from the party in July 2002.