Complex sentence: Such dancers may be unaware of or may choose to ignore the fact that an emaciated dancer will not have the strength required for ballet and is at a higher risk for injuries and long-term health problems.
Split into simpler sentences: Such dancers may be unaware of or may choose to ignore the fact that an emaciated dancer will not have the strength required for ballet. A dancer with poor nutrition is at a higher risk for injuries and long-term health problems.