Complex sentence: It's when her wedding gets called off because her fiancé calls off the wedding (Rajkummar Rao), Rani gets the biggest shock of her life and is totally confused.
Split into simpler sentences: It's when her wedding gets called off because her fiancé doesn't want to marry her anymore (Rajkummar Rao). Anywho, Rani gets the biggest shock of her life and is totally confused.