Complex sentence: If the patient reports that dizziness occurs after particular movements and lasts seconds to a few minutes, this suggests decompensation: the brain has'forgotten' the fine-tuning procedure it developed during the chronic compensation phase described above.
Split into simpler sentences: If the patient reports that dizziness occurs after particular movements and lasts seconds to a few minutes, this suggests decompensation. Decompensation simply means that the brain has'forgotten' the fine-tuning procedure it developed during the chronic compensation phase described above.