Complex sentence: In Maciel, Cochet began to work an apprentice telegraphist, and in 1912 he moved to Rosario to dedicate himself to painting while working as a telegraphist in the postal office.
Split into simpler sentences: In Maciel, Cochet began to work an apprentice telegraphist. In 1912 he moved to Rosario to dedicate himself to painting while working as a telegraphist in the postal office.