Nature has designed White Birds with leaves that split and tear easily so they are not uprooted in strong winds outdoors. When grown indoors, wind is not an issue, but there are several conditions that will contribute to excessive splitting.
Low humidity can be part of the problem, but that can be counteracted if the roots are kept sufficiently moist. If yours is properly potted its nursery pot, then it should be watered thoroughly as soon as the top surface feels dry. Misting will not help unless you plan to mist hourly every day! A humidifier may help somewhat. But proper watering is more important.
White Birds require a lot of very bright light. They must be right in front of a north or east window and a few feet back from a south or west window. Inadequate light will lead to weak stems and leaf splitting.
Most leaf splitting occurs as new leaves unfurl. If water and light are insufficient, the unfurling does not go smoothly and the leaves get "stuck" as they open up partially, small sections at a time. If one section opens and an adjacent section does not, then the new leaf will tear. It is hard to explain, but you can assist with the unfurling by gently using your fingers. But if they are not unfurling properly, it is an indication of inadequate light or water.
BTW, leaf splitting is only an aesthetic issue and does not mean the plant is dying.
