Complex sentence: Blok and Corrigan perform extra-vehicular activity (EVA) to repair the system outside, but an accident irreparably contaminates Corrigan's suit and he is left outside the ship as it continues its journey to Europa.
Split into simpler sentences: Blok and Corrigan perform extra-vehicular activity (EVA) to repair the system from outside. He is abandoned outside the ship as it continues its journey to Europa.