Complex sentence: He studied chess at an early age, along with Tigran Petrosian, then from 1942 to 1945 he worked as a draftsman and designer at a factory in Tbilisi.
Split into simpler sentences: He studied chess at an early age, along with Tigran Petrosian. From 1942 to 1945 he worked as a draftsman and designer at a factory in Tbilisi.