Complex sentence: Dark Horse Comics' "Boris the Bear" was launched in response to these TMNT clones; its first issue was titled "Boris the Bear Slaughters the Teenage Radioactive Black Belt Mutant Ninja Critters".
Split into simpler sentences: Dark Horse Comics' "Boris the Bear" was launched in response to these TMNT clones. Its first issue was titled "Boris the Bear Slaughters the Teenage Radioactive Black Belt Mutant Ninja Critters".