Complex sentence: Eden made her Broadway debut with the original company of Stephen Schwartz's musical "Wicked", where she originated the position as the standby for Idina Menzel in the role of Elphaba.
Split into simpler sentences: Eden made her Broadway debut as part of the original broadway cast of Stephen Schwartz's musical "Wicked". She originated the position of the standby for Idina Menzel in the lead role of Elphaba.