Complex sentence: Abby, a Jew, loses her composure when informed by Joshua's grandmother that Joshua wishes to be baptized, becoming unhinged and screaming profanities at her mother-in-law, as well as demanding that she leave the home immediately.
Split into simpler sentences: Abby, a Jew, absolutely lost her composure when informed by Joshua's grandmother that he wished to be baptized. She became unhinged and screamed profanities at her mother-in-law, demanding that she leave the home immediately.