Complex sentence: Hellboy, Abe Sapien, Witchfinder, Lobster Johnson and the B.P.R.D. are comic book creations by Mike Mignola and usually published by Dark Horse Comics that have been featured in numerous mini-series, one-shots, back-up features, cross-overs and guest appearances.
Split into simpler sentences: Hellboy, Abe Sapien, Witchfinder, Lobster Johnson, and the B.P.R.D. are comic book creations by Mike Mignola and are usually published by Dark Horse Comics. They have been featured in numerous mini-series, one-shots, back-up features, cross-overs, and guest appearances.