Complex sentence: It tells how Iseut begged Almucs de Castelnau to pardon Gigo (Gui), lord of Tournon (Tornon) in the Vivarais, Iseut's knight, who had committed "a great fault" against Almucs.
Split into simpler sentences: It tells how Iseut begged Almucs to pardon Gigo (Gui), lord of Tournon (Tornon) in the Vivarais. Gigo was Iseut's knight, but had committed "a great fault" against Almucs.