Complex sentence: Unlike MK's' Fatalities', they can be done at any time the player desires, except for a' Super Death Move', which can only be done while next to the opponent and by pressing all five buttons while s/he is stunned.
Split into simpler sentences: Unlike MK's' Fatalities', they can be done at any time the player desires. There is also a' Super Death Move', which can only be done while next to the opponent and by pressing all five buttons while s/he is stunned.