Complex sentence: Reaper is the name of several fictional characters in the pages of Marvel Comics, most notably the Reaper whose real name is Pantu Hurageb, a mutant in the "X-Force" comic book series.
Split into simpler sentences: Reaper is the name of several fictional characters appearing in American comic books published by Marvel Comics. The character known most notably as the Reaper whose real name is Pantu Hurageb, a mutant in the "X-Force" comic book series.