Complex sentence: However, the whales seem to re-colonize and extending their wintering habitats into other areas as the numbers of whales seen at Warrnambool do not show dramatically increases, but numbers of sightings occurred in other areas are showing slow but good increases.
Split into simpler sentences: However, the whales seem to be increasing and extending their wintering habitats into other areas, as the numbers of whales seen at Warrnambool do not show dramatic increases. The number of sightings occurring in other areas are showing slow but good increases.