Complex sentence: Seventy-six locomotives survived into British Railways ownership in 1948; of these, 64 were given BR numbers, being the 1946 LNER numbers increased by 60000.
Split into simpler sentences: Seventy-six locomotives survived into British Railways (BR) ownership in 1948. Of these, 64 were given BR numbers, being the 1946 LNER numbers increased by 60000.