Complex sentence: When Jay Sonza had to leave the show to run for a seat in the senate in 2004, the program was renamed "Partners Mel Tiangco", and eventually "Partners Mel and Joey" when Joey de Leon was introduced as Tiangco's new co-host.
Split into simpler sentences: When Jay Sonza had to leave the show to run for a seat in the senate in 2004, the program was renamed "Partners Mel Tiangco". Eventually it became "Partners Mel and Joey" when Joey de Leon was introduced as Tiangco's new co-host.