Complex sentence: Chloe Hornblower goes to the Hillcrests, begging them to help keep the secret from her husband, who is aware that something is going on, then hides behind a curtain when her husband storms into the Hillcrest home demanding to know the secret.
Split into simpler sentences: Chloe Hornblower goes to the Hillcrests, begging them to help keep the secret from her husband, who is aware that something is going on. She is forced to hide behind a curtain when her husband unexpectedly storms into the Hillcrest home, demanding to know the secret.