Complex sentence: Later on, Shiki discovers that the current body inhabited by Roa is that of Shiki's stepbrother, who possesses the same name as Shiki currently uses, and that Roa tricked Arcueid some 800 years ago into drinking blood.
Split into simpler sentences: Later on, Shiki discovers that the current body inhabited by Roa is that of Shiki's stepbrother, who possesses the same name as Shiki currently uses. It was later revealed that Roa tricked Arcueid some 800 years ago into drinking blood.