Complex sentence: Johnson's father later became a partner in his son-in-law's business, and when Dr. Johnson died in 1797, Edward Johnson took over his father's share in the company, eventually becoming its sole owner by 1807.
Split into simpler sentences: Johnson's father later became a partner in his son-in-law's business. When Dr. Johnson died in 1797, Edward Johnson took over his father's share in the company, eventually becoming its sole owner by 1807.