Complex sentence: Zorro goes to Armand's mansion, meets Elena, and eavesdrops on Armand's meeting, learning that the soap bars contain glycerin--a precursor to nitroglycerin.
Split into simpler sentences: Zorro goes to Armand's mansion, meets Elena, and eavesdrops on Armand's meeting. He learns that the soap bars contain glycerin-a precursor to nitroglycerin.