Complex sentence: In 1913 the city of San Marino was incorporated separately from San Gabriel, and Patton was elected the first Mayor, and he served from April 1913 to April 1922, and again from October 1922 to August 1924.
Split into simpler sentences: In 1913 the city of San Marino was incorporated separately from San Gabriel, and Patton was elected the first Mayor. He served from April 1913 to April 1922, and again from October 1922 to August 1924.