Complex sentence: Besides rubber boots, the company also sells other products such as bags, socks and other accessories, and historically has been involved in the manufacture of tyres, conveyor belts, combs, golf balls, hot water bottles and rubber flooring.
Split into simpler sentences: Besides rubber boots, the company also sells other products such as bags, socks, and other accessories. Historically, they have also been involved in the manufacture of tyres, conveyor belts, combs, golf balls, hot water bottles and rubber flooring.