Complex sentence: Ray became the state's fourth governor on February 12,1825, when Indiana governor William Hendricks resigned from his office to become a U.S. senator and the lieutenant governor's office remained vacant after Boon's departure for the U.S. House of Representatives the previous year.
Split into simpler sentences: Ray became the state's fourth governor on February 12,1825, when Indiana governor William Hendricks resigned from his office to become a U.S. senator. The lieutenant governor's office had remained vacant after Boon's departure for the U.S. House of Representatives the previous year.