Complex sentence: Mistletoebirds mostly occur in forests and woodlands dominated by any species of Eucalyptus from the dry interior to the coastal rain forests, but they do not frequent high altitude areas in winter as they adopt a torpid state when cold.
Split into simpler sentences: Mistletoebirds mostly occur in forests and woodlands dominated by any species of Eucalyptus from the dry interior to the coastal rain forests. They do not frequent high altitude areas in winter as they adopt a torpid state when cold.