Complex sentence: Caesar was developed in the 1990s as a technology demonstrator by the French state owned company GIAT Industries; it was first shown in public in 1994 and four years later a pre-production model underwent trials with the French Army.
Split into simpler sentences: Caesar was developed in the 1990s as a technology demonstrator by the French state-owned company GIAT Industries; it was first shown in public in 1994. Four years later a pre-production model underwent trials with the French Army.