Complex sentence: Rancho Arroyo de la Alameda was a Mexican land grant in present day Alameda County, California given in 1842 by Governor Juan B. Alvarado to José de Jesús Vallejo.
Split into simpler sentences: Rancho Arroyo de la Alameda was a Mexican land grant in present day Alameda County, California. It was given in 1842 by Governor Juan B. Alvarado to José de Jesús Vallejo.