en_tn/mat/08/17.md

was fulfilled that which had been spoken by Isaiah the prophet

This can be stated in active form. Alternate translation: "Jesus fulfilled the prophecy that the prophet Isaiah had spoken to the people of Israel" (See: rc://en/ta/man/translate/figs-activepassive)

took our sickness and bore our diseases

Matthew is quoting the prophet Isaiah. These two phrases mean basically the same thing and emphasize that he healed all of our diseases. Alternate translation: "healed those who were sick and made them well" (See: rc://en/ta/man/translate/figs-parallelism)