Complex sentence: From 1993 to 1998, he worked for Central Azucarera de Tarlac, the sugar refinery in charge of the Cojuangco-owned Hacienda Luisita, as the executive assistant for administration from 1993 to 1996, then he worked as manager for field services from 1996 to 1998.
Split into simpler sentences: From 1993 to 1998, he worked for Central Azucarera de Tarlac, the sugar refinery in the Cojuangco-owned Hacienda Luisita. He was employed as the executive assistant for administration from 1993 to 1996 and subsequently worked as manager for field services from 1996 to 1998.