Complex sentence: Its principal boundaries are the Golden State (I-5) and Antelope Valley (SR-14) freeways; their merger in Newhall Pass at the city's southernmost point gives Santa Clarita a triangular appearance on the map.
Split into simpler sentences: Its principal boundaries are the Golden State (I-5) and Antelope Valley (SR-14) freeways. Their merger in Newhall Pass at the city's southernmost point gives Santa Clarita a triangular appearance on the map.