Complex sentence: At the grand re-opening of Goldman's Pharmacy, Peter buys a "come in, we're open" sign and decides to go in to business for himself but Joe is forced to shut him down for having an unlicensed business.
Split into simpler sentences: At the grand re-opening of Goldman's Pharmacy, Peter buys a "come in, we're open" sign. Peter then decides to go in to business for himself, which becomes short-lived when Joe is forced to shut him down for having an unlicensed business.