Complex sentence: The first units shipped in July 2015 and by November 2015, tens of thousands of backers received their cooler, with the company estimating they would clear the large backlog by April 2016.
Split into simpler sentences: The first units were shipped in July 2015, and by November 2015 tens of thousands of backers received their cooler. The company estimated they would clear the large backlog by April 2016.