Complex sentence: In 2015, Fraunhofer ISE did a study commissioned by Berlin-based German renewable think tank "Agora Energiewende" and concluded that most scenarios fundamentally underestimate the role of solar power in future energy systems.
Split into simpler sentences: In 2015, Fraunhofer ISE did a study commisioned by Berlin-based German renewable think tank "Agora Energiewende". It concluded that most scenarios fundamentally underestimate the role of solar power in future energy systems.