Complex sentence: The farthing ceased to be legal tender after 31 December 1960; the fact that farthings had recently ceased to be legal tender is referred to in the first episode of Z Cars, shown in January 1962.
Split into simpler sentences: The farthing ceased to be legal tender after 31 December 1960. The fact that farthings had recently ceased to be legal tender is referred to in the first episode of Z Cars, shown in January 1962.