Complex sentence: The 1990 Luzon earthquake occurred on July 16 at 4:26 p.m. local time on the densely populated island of Luzon in the Philippines surface wave magnitude of 7.8 and produced a 126 km-long ground rupture that stretched from Dingalan, Aurora to Cuyapo, Nueva Ecija.
Split into simpler sentences: The 1990 Luzon earthquake occurred on July 16 at 4:26 p.m. local time on the densely populated island of Luzon in the Philippines. The shock had a surface wave magnitude of 7.8 and produced a 125 km-long ground rupture that stretched from Dingalan, Aurora to Cuyapo, Nueva Ecija.