Complex sentence: From 1998 to 1999, he worked as a Kosovo ceasefire verifier and then became the head of security for Aga Khan IV. This involved helping to create a base for the Aga Khan at Chantilly, Oise.
Split into simpler sentences: From 1998 to 1999, he worked as a Kosovo ceasefire verifier. He became the head of security for Aga Khan IV. This involved helping to create a base for the Aga Khan at Chantilly, Oise.