Complex sentence: In 1981 he started working in Vupik, Vukovar.He got his first son Marko in 1981, and his second son Stjepan in 1984.
Split into simpler sentences: In 1981 he started working in Vupik, Vukovar. ISSN 1330-500X He got his first son Marko in 1981, and his second son Stjepan in 1984.