Complex sentence: Michael Theodore Vickery (circa 1931--29 June 2017) was a historian and author, who worked as an associate professor and lecturer on Southeast Asian history at the Universiti Sains Malaysia in Penang, Malaysia (1989).
Split into simpler sentences: Michael Theodore Vickery (circa 1931--29 June 2017) was a historian and author. Vickery worked as an associate professor and lecturer on Southeast Asian history at the Universiti Sains Malaysia in Penang, Malaysia (1989).