Complex sentence: Gilling joined Hammer Films in 1961 directing "Shadow of the Cat" where he achieved his greatest fame with several horror films as well as making the non-horror Hammer films "The Pirates of Blood River" (1962) and "The Scarlet Blade".
Split into simpler sentences: Gilling joined Hammer Films in 1961, directing "Shadow of the Cat". He achieved his greatest fame with several Hammer horror films as well as making the non-horror Hammer films "The Pirates of Blood River" (1962) and "The Scarlet Blade".