Complex sentence: California Historical Landmark 344, near the intersection of what are now State Routes 33 and 198, marks the approximate site of his headquarters, Arroyo de Cantua, where he was slain.
Split into simpler sentences: California Historical Landmark 344 near the intersection of what are now State Routes 33 and 198. The area marks the approximate site of his headquarters, Arroyo de Cantua, where he was slain.