Complex sentence: When she learned that one daughter became addicted to heroin, she undertook a pilgrimage to the Sanctuary of Our Lady of Polsi in Calabria where she pledged to stop dealing heroin and only sell hashish in the hope that her daughter would overcome her addiction.
Split into simpler sentences: When she learned that one daughter became addicted to heroin, she undertook a pilgrimage to the Sanctuary of Our Lady of Polsi in Calabria. She pledged to stop dealing heroin and only sell hashish in the hope that her daughter would overcome her addiction.