Complex sentence: In 2014 Zenefits was named the fastest-growing startup of the year, and its annual recurring revenues continued to grow, from $20 million in 2014 to $100 million in 2015.
Split into simpler sentences: In 2014 Zenefits was named the fastest-growing startup of the year. Its annual revenues grew, from $20 million in 2014 to $100 million in 2015.