Complex sentence: By the end of 2016, total PV capacity had increased to over 77.4 GW, and in 2017 China was the first country to pass 100 GW of cumulative installed PV capacity.
Split into simpler sentences: By the end of 2016, total PV capacity had increased to over 77.4 GW,. In 2017 China was the first country to pass 100 GW of cumulative installed PV capacity.