Complex sentence: The city of Houston's extraterritorial jurisdiction (ETJ) stretches well west of the City of Katy which means most of the Katy area may be annexed by the City of Houston at some time in the future.
Split into simpler sentences: The city of Houston's extraterritorial jurisdiction (ETJ) stretches well west of the City of Katy. This means that most of the Katy area may be annexed by the City of Houston at some time in the future.