Complex sentence: Greenall's introduced minor changes to the production of the various Shipstones beers and increased the marketing of the company, in 1987 Shipstones became the main shirt sponsor of Nottingham Forest Football Club, in an arrangement which continued until 1994.
Split into simpler sentences: Greenall's introduced minor changes to the production of the various Shipstones beers and increased the marketing of the company. In 1987,vShipstones became the main shirt sponsor of Nottingham Forest F.C., an arrangement which continued until 1994.