Complex sentence: He eventually manages too successfully defend a guy being attacked by a group of thugs, his actions are filmed and posted on Youtube and because of this he becomes an over night celebrity and eventually begins inspiring more people to do what he does.
Split into simpler sentences: He eventually manages to successfully defend a guy being attacked by a group of thugs. His actions are filmed and posted on YouTube and becomes an overnight celebrity and eventually begins inspiring more people to do what he does.