Complex sentence: The $93 million renovation was completed in partnership with a private developer, ACE Theatrical Group of Houston, which had previously overseen major restorations of a number of historic theaters including the Boston Opera House.
Split into simpler sentences: The $93 million renovation is being completed in partnership with a private developer, ACE Theatrical Group of Houston. ACE has previously overseen major restorations of a number of historic theaters including the Boston Opera House.