Complex sentence: Complete nationalisation had been considered, and the Railways Act 1921 is sometimes considered as a precursor to that, but the concept was rejected; nationalisation was subsequently carried out after World War II, under the Transport Act 1947.
Split into simpler sentences: Complete nationalisation had been considered, and the Railways Act 1921 is sometimes considered as a precursor to that, but the concept was rejected. Nationalisation was subsequently carried out after World War II, under the Transport Act 1947.