Complex sentence: The incubation of the eggs is carried out solely by the female, lasting 14--16 days and the chicks are fed by regurgitation by the female until fledging, although occasionally the male also feeds the young.
Split into simpler sentences: The incubation of the eggs is carried out solely by the female. This lasts 14 to 16 days and the chicks are fed by regurgitation by the female until they fledge, though occasionally the male may also feed the young.