Complex sentence: Adult beetles feed on leaves of trees, shrubs, brassicas and foliage of pasture crops, if there is a concentrated group of beetles flying in one area there is potential to defoliate seedling crops and fruit trees.
Split into simpler sentences: Adult beetles feed on leaves of trees, shrubs, brassicas and foliage of pasture crops. If there is a concentrated group of beetles flying in one area there is potential to defoliate seedling crops and fruit trees.