Complex sentence: In 1927, Riley hired Arthur Hall to be a salesman, and, in 1934, Hall became a business partner and soon found his niche by marketing his products to people whose jobs required them to spend much time standing.
Split into simpler sentences: In 1927, Riley hired Arthur Hall to be a salesman. In 1934, Hall became a business partner and found his niche by marketing to people whose jobs required them to spend much time standing.