Complex sentence: The company started in a subleased corner of an Excite@Home office by Mark Pincus, Scott Dale and Cadir Lee, at that time the focus was on developing and improving the company's DNA Probe technology.
Split into simpler sentences: The company started in a subleased corner of an Excite@Home office by Mark Pincus, Scott Dale, and Cadir Lee. At that time the focus was on developing and improving the company's DNA Probe technology.