Complex sentence: Cuba's fight for its independence was watched closely by the Catalanists of the nineteenth century and in 1906, when the Cuban War of Independence ended, the "Centre Catalanista de Santiago de Cuba" (Catalanist Centre of Santiago de Cuba) was created.
Split into simpler sentences: Cuba's fight for its independence was watched closely by the Catalanists of the nineteenth century. When the Cuban War of Independence ended, in 1906, the "Centre Catalanista de Santiago de Cuba" (Catalanist Centre of Santiago de Cuba) was created.