Complex sentence: In the fall of 1916, he moved to New York and lived in a small boarding house in Brooklyn, finding work as a clerk in the law firm of Nevins, Brett and Kellog, in Manhattan.
Split into simpler sentences: In the fall of 1916, he moved to New York. There he lived in a small boarding house in Brooklyn, finding work as a clerk in the law firm of Nevins, Brett and Kellog, in Manhattan.