Complex sentence: She plans to tease him until Zeffie finds them there, but he is prepared for her plan and will not accept any delay; the act ends with him telling her that she must fulfill her "marriage debt" to him.
Split into simpler sentences: She plans to tease him until Zeffie finds them there. However, he is prepared for her plan and will not accept any delay; the act ends with him telling her that she must fulfill her "marriage debt" to him.