Complex sentence: When Gioconda tries to leave, she is caught red handed by Barnaba.Then pretends to welcome his arrival, but under cover of decking herself in her jewellery, she seizes a dagger and stabs herself to death.
Split into simpler sentences: When Gioconda tries to leave, she is caught by Barnaba. She then pretends to welcome his arrival, but under cover of decking herself in her jewellery, she seizes a dagger and stabs herself to death.