Complex sentence: An acoustic version of the song debuted in Maui, Hawaii by Young and his backing band called Promise of the Real to bring attention to Monsanto's destructive practices in Hawaii.
Split into simpler sentences: An acoustic version of the song was debuted in Maui, Hawaii by Young and his backing band called Promise of the Real. The reason for it being done there was to bring to attention the attention to Monsanto's destructive practices in Hawaii.