Complex sentence: Little is known about the average life-span of these birds, but it is approximated at 50 to 70 years in the wild, but the oldest death recorded in captivity is 118 years old.
Split into simpler sentences: Little is known about the average life-span of these birds. It is approximated at 50 to 70 years in the wild, but the oldest death recorded in captivity is 118 years old.