Complex sentence: Jackson's Pipit has been considered a subspecies of the Long-billed Pipit (Sibley and Monroe suggested that it might be conspecific with the "bannermani" subspecies of the Long-billed Pipit) and a subspecies or morph of the African Pipit.
Split into simpler sentences: Jackson's Pipit has been considered a subspecies of the Long-billed Pipit (Sibley and Monroe suggested that it might be conspecific with the "bannermani" subspecies of the Long-billed Pipit). It has also been considered a subspecies or morph of the African Pipit.