Complex sentence: This has been used successfully to treat hematological aspects of disease, although SDS patients seem to have an elevated occurrence of adverse events, including graft-versus-host disease (GVHD) and toxicity relating to the pre-transplant conditioning regimen.
Split into simpler sentences: This has been used successfully to treat hematological aspects of disease. However, SDS patients have an elevated occurrence of BMT-related adverse events, including graft-versus-host disease (GVHD) and toxicity relating to the pre-transplant conditioning regimen.