Complex sentence: Many important people in the gaming field have posted on the site, including the creator of the Hot Coffee Mod and the founder of the IEMA, Hal Halpin, both of whom registered an LJ account to converse with gamers in the comment section.
Split into simpler sentences: Many important people in the gaming field have posted on the site, including the creator of the Hot Coffee Mod and the founder of the IEMA, Hal Halpin. Both of who registered an LJ account to converse with gamers in the comment section.