Complex sentence: Kneeling Spirit of Ecstasy (1934-1939 and 1946-1956) mounted on most of the radiators, except units 15 and 18 (chassis 4CS4).
Split into simpler sentences: Kneeling Spirit of Ecstasy made between 1934-1939 and 1946-1956. It was mounted on most of the radiators, except in units 15 and 18 (chassis 4CS4).