Bird. OF paradise.
The leaves are splitting on the plant, the edges are black. Some leaves are yellow with brown inside.
Black edges on the leaves suggest a root problem, such as a root rot. This can be caused by overwatering at a time when the plant is using little water, and so it sits in unused water and roots drown.
Bird of Paradise plant needs a cool winter rest period. During that period, they should not be watered as liberally as they are during their active growth period. Water just enough to keep the soil from completely drying out.
During the active growth period, let the top inch of soil dry out between waterings.
For the cool rest period, a 55 degree temperature is good. Always provide 3-4 hours of direct sunlight daily.
We're not sure what you mean by the splitting and color descriptions. If you can attach photos of these issues, we may be able to be more helpful.
We can only see a part of another houseplant's leaf, but it looks like a philodendron.
We don't see any insect or disease problems on your bird of paradise. So, it is probably a result of growing conditions, i.e. too little direct sunlight, too much water in winter, or not cool enough in winter.