Complex sentence: Although a great number of eggs were laid on the prairie during outbreak years, individuals hatched from these eggs usually did not thrive, a condition that has been attributed to the lack of adaptation of this species to prairie habitats.
Split into simpler sentences: Although a great number of eggs were laid on the prairie during outbreak years, individuals hatched from these eggs usually did not thrive. A condition that has been attributed to the lack of adaptation of this species to prairie habitats.