Complex sentence: Williams died at the controls of his T-38 near Tallahassee, Florida, when the plane went into an uncontrollable aileron roll while he was flying from the Cape to Mobile, Alabama, en route to see his father who was dying of cancer.
Split into simpler sentences: Williams died at the controls of his T-38 near Tallahassee, Florida. His plane went into an uncontrollable aileron roll while he was flying from the Cape to Mobile, Alabama, en route to see his father who was dying of cancer.