Complex sentence: C.S.R. (Combinatul Siderurgic Reșița) and U.C.M.R. (Uzina Constructoare de Mașini Reșița) are the factories which sustained the city's life for more than 300 years.
Split into simpler sentences: C.S.R. (Combinatul Siderurgic Reșița) and U.C.M.R. (Uzina Constructoare de Mașini Reșița). The two are called as Reșița works and are the factories which sustained the city's life for more than 300 years.