Complex sentence: Over his 16-year term as president, mergers and purchases of affiliated companies increased PRR investments to about $115,000,000, and the Pennsylvania Railroad became the largest private employer in the United States and the largest business corporation in the world.
Split into simpler sentences: Over his 16-year term as president, mergers and purchases of affiliated companies increased PRR investments to about $115,000,000. And the Pennsylvania Railroad became the largest private employer in the United States and the largest business corporation in the world.