Complex sentence: The Moores had planned to locate the school on their property near Palestine, Texas--where a branch of Chinquapin Creek and several Chinquapin trees can be found--but were convinced they needed to be closer to Houston.
Split into simpler sentences: The Moores had planned to locate the school on what was the Moore's property near Palestine, Texas, where a branch of then Chinquapin Creek and several Chinquapin trees can be found. But were convinced they needed to be closer to Houston.