Original sentence: While at Dell, Rollins oversaw company plans to spend more on staff training and customer services, and sales increased $14.2 billion--up 6% year on year with a net income of $762 million
Edited sentence: While at Dell, Rollins oversaw company plans to spend more on staff training and customer services, and sales increased $14.2 billion—up 6% year on year with a net income of $762 million