Complex sentence: Toyota delivered 7 plug-ins in February and sold 891 units March 2012, its first full month on the market, and in April 2012 the Prius PHV was the top selling plug-in electric car for that month.
Split into simpler sentences: Toyota delivered 7 plug-ins in February and sold 891 units March 2012, its first full month on the market. Cumulative sales through April 2012 reached 2,552 units, and it was the top selling plug-in electric car that month.