Complex sentence: Charles was famously fouled by Paul Gascoigne in the 1991 FA Cup Final, causing Gascoigne's cruciate ligaments to tear and forcing him out the game for several months.
Split into simpler sentences: Charles was famously fouled by Paul Gascoigne in the 1991 FA Cup Final. This was the challenge that caused Gascoigne's cruciate ligaments to tear and forcing him out the game for several months.