Complex sentence: Gil Maria Ybarra (April 21,1784, San Diego-1855, Rancho Rincon de la Brea) was síndico of Los Angeles in 1831, and alcalde of Los Angeles in 1836-1837.
Split into simpler sentences: Gil Maria Ybarra (April 21,1784, San Diego-1855, Rancho Rincon de la Brea) was appointed síndico of Los Angeles in 1831. He was alcalde of Los Angeles in 1836-1837.