Complex sentence: Unfortunately, Parker later learned the truth after he went to the hospital to see Elissa and became angry with her for hiding this secret from him, prompting her to abruptly quit the firm and move back to Chicago with her son.
Split into simpler sentences: Unfortunately, Parker later learned the truth after he went to the hospital to see Elisa, and he became angry with her for hiding this secret from him. This prompted her to abruptly quit the firm and move back to Chicago with her son.