Complex sentence: Feline Federation Europe recognizes a similarly-defined breed, a semi-long-haired version of the British Shorthair, called both the Highlander and the Highland Straight.
Split into simpler sentences: Feline Federation Europe (FFE) recognizes a similarly-defined breed, a semi-long-haired version of the British Shorthair. FFE calls them both the Highlander and the Highland Straight.