Complex sentence: According to Akita, to transmit the message of the songs properly, they perform behind a screen while live, in which are casted images related and the lyrics of the song, in a way that the crowd wouldn't be able to see their bodies.
Split into simpler sentences: According to Akita, in order to transmit the message of the songs properly, they performed behind a screen in which related images and the song lyrics were projected. This was done in a way such that the crowd wouldn't be able to see their bodies.