Complex sentence: At age four, Waite was healed of debilitating stuttering defect, but was later diagnosed with Ankylosing Spondylitis, a life-threatening inflammatory disease that affects the spine.
Split into simpler sentences: At age four, Waite was healed of debilitating stuttering defect. Around the same time, Waite was diagnosed with Ankylosing Spondylitis, a life-threatening inflammatory disease that affects the spine.