Complex sentence: The cars, numbered 2500--2924, cost about $1 million each and they replaced many R10s dating from 1948, all remaining 6300-series R16s dating from 1954 to 1955, and some R27s and R30s dating from 1960 to 1962.
Split into simpler sentences: The cars, numbered 2500--2924, cost about $1 million each. They replaced many R10s dating from 1948, all remaining 6300-series R16s dating from 1954 to 1955, and some R27s and R30s dating from 1960 to 1962.