Complex sentence: The line saw little change in the late 19th and early 20th centuries and it remained part of the CLC in the 1923 regrouping, on nationalistion it became part of the London Midland Region of British Railways in 1948 at the final demise of the CLC.
Split into simpler sentences: The line saw little change in the late 19th and early 20th centuries and it remained part of the CLC in the 1923 Grouping. On nationalistion it became part of the London Midland Region of British Railways in 1948 at the final demise of the CLC.