Sentence Correction (SC) | The numerous illnesses and injuries suffered by John F. Kennedy during

The numerous illnesses and injuries suffered by John F. Kennedy during his presidency have been relatively well established by recently released records, but what is much more challenging to determineare the effect of his health problems on his presidential decisions, on his family life, and on his legacy.


A. have been relatively well established by recently released records, but what is much more challenging to determine are
B. has been relatively well established by recently released records,
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