Complex sentence: Max also implores the downstairs neighbor for help, but it turns out that Adolph, the youth who had spied on him earlier, is there, and will only get food for them if Max lets Lucia go.
Split into simpler sentences: Max also implores the downstairs neighbor for help, but it turns out that Adolph, the youth who had spied on him earlier, is there. Adolph will only get food for them if Max lets Lucia go.