Original sentence: She is scheduled to again play Glinda, replacing Alli Mauzey in the Broadway production, as of August 11, 2009.She then took over the role of Glinda from Megan Hilty in the Los Angeles production from May 20, 2008 until September 26, 2008
Edited sentence: She is scheduled to play Glinda again replacing Alli Mauzey in the Broadway production from August 11, 2009 for an open-ended contract.She then took over the role of Glinda from Megan Hilty in the Los Angeles production from May 20, 2008 until September 27, 2008 when Megan Hilty returned to the role