Complex sentence: Released in 2008, the Enphase M175 model was the first commercially successful microinverter; a successor, M190, was introduced in 2009, and the latest model, the M215, in 2011.
Split into simpler sentences: Released in 2008, the Enphase M175 model was the first commercially successful microinverter. A successor, the M190, was introduced in 2009, and the latest model, the M215, in 2011.