Complex sentence: Theseus is pleased with Hippolytus'suffering, until Artemis appears and scolds Theseus for his rash decision, clears Hippolytus's name, and regrets that she could not intervene.
Split into simpler sentences: Theseus is pleased with Hippolytus'outcome, until Artemis appears to clear Hippolytus' name. She scolds Theseus for his rash decision, explains the true version of events, and regrets that she could not intervene.