Complex sentence: He worked for the Philadelphia firm of Furness, Evans & Co. from 1913 to 1916, and then joined the partnership of Walter Mellor & Arthur I. Meigs.
Split into simpler sentences: He worked for the Philadelphia firm of Furness, Evans & Co. from 1913 to 1916. In 1916, he joined the partnership of Walter Mellor & Arthur I. Meigs.