Complex sentence: Rancho Atascadero was a Mexican land grant in present-day San Luis Obispo County, California given in 1842 by Governor Juan Alvarado to Trifon Garcia.
Split into simpler sentences: Rancho Atascadero was a Mexican land grant in present-day San Luis Obispo County, California. It was granted in 1842 by Governor Juan Alvarado to Trifon Garcia.