Complex sentence: Returning from the Holy Land with a small band of followers, Richard was captured by Leopold while returning from the crusade and was passed to Henry the Lion, who held him for eighteen months (1192--1194) for a ransom valued at 100,000 marks.
Split into simpler sentences: Returning from the crusade with a small band of followers, Richard was captured by Leopold and was passed to Henry the Lion. Henry held Richard captive for eighteen months (1192--1194) for a ransom valued at 100,000 marks.