Complex sentence: The fault was delineated by the mainshock and aftershock focal mechanisms, fault plane reflection studies, and high resolution seismic profiles, which also revealed that the fault runs from downtown Los Angeles to near Puente Hills.
Split into simpler sentences: The fault was delineated by the mainshock and aftershock focal mechanisms, fault plane reflection studies, and high resolution seismic profiles. These methods indicate that the fault runs from downtown Los Angeles to near Puente Hills.