Complex sentence: Strepsiades goes home happy and the Clouds step forward to address the audience a second time, demanding to be awarded first place in the festival competition, in return for which they promise good rains-otherwise they'll destroy crops, smash roofs and spoil weddings.
Split into simpler sentences: Strepsiades goes home happy and the Clouds step forward to address the audience a second time. The Clouds demand to be awarded first place in the festival competition, in return for which they promise good rains-otherwise they'll destroy crops, smash roofs and spoil weddings.