Complex sentence: In 1931 he set up the Smollan Group, initally as a sales agency, which now employs 34,000 people and outsources marketing services across the world.
Split into simpler sentences: In 1931 he set up a business Smollan Holdings, initally as a sales agency. Smollan Holdings expanded to become the Smollan Group, a multinational company which now employs 34,000 people and outsources marketing services across the world.