Complex sentence: His father was originally from Pula, but studied to become a tax official in Novi Sad, after which he had to move often because of his job, while his mother was from Dubrovnik and moved to Vojvodina for a job in the postal service.
Split into simpler sentences: His father was originally from Pula, but he studied to become a tax official in Novi Sad. His mother was from Dubrovnik and moved to Vojvodina for a job in the postal service.