Complex sentence: Marvel Comics invented Cobra, with the concept and name coming from Archie Goodwin: when they were brought in, Hasbro hadn't thought of doing a villain for the toyline, and were reluctant to make villain toys as they believed villains didn't sell.
Split into simpler sentences: Marvel Comics invented Cobra with the concept and name coming from Archie Goodwin. When Marvel were brought in, Hasbro hadn't thought of producing a villain for the toy line, and they were reluctant to make villain toys, because they believed villains didn't sell.