Complex sentence: His first notable Hollywood appearance was that of an Irish republican terrorist in the 1992 film adaptation of "Patriot Games"; whilst filming his death scene, Harrison Ford hit him with a boat hook, giving him a permanent scar.
Split into simpler sentences: His first notable Hollywood appearance was that of an Irish republican terrorist in the 1992 film adaptation of "Patriot Games". While filming his death scene, Harrison Ford hit him with a boat hook, giving him a permanent scar.