Complex sentence: Because of the tensions caused the stabbings in Istanbul, only 70 Beşiktaş fans travelled to Leeds on an official club flight, which was eventually cancelled as was pre-match hospitality prepared by Leeds' directors.
Split into simpler sentences: Because of the tensions caused the stabbings in Istanbul, only 70 Beşiktaş fans travelled to Leeds. They had originally been booked onto an official Beşiktaş chartered flight however, it was eventually cancelled as was pre-match hospitality prepared by Leeds' directors.