Complex sentence: In times of drought, many of the State's grazing pastures died off and due to its drought hardiness, Echium was used a source of food for grazing animals, hence the name Salvation Jane.
Split into simpler sentences: In times of drought, many of the states grazing pastures died. Due to its drought hardiness, Echium was a source of food to the grazing animals in the state, hence the name Salvation Jane.