Complex sentence: Jemma Rix is an Australian theatre performer, currently starring as Elphaba in the Australian production of "Wicked", after serving as the standby for the role, and playing the role at Universal Studios Japan.
Split into simpler sentences: Jemma Rix is an Australian theatre performer, currently starring as Elphaba in the Australian production of "Wicked". She previously served as the standby for the role, and played the role at Universal Studios Japan.