Default Is this good English?

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I am translating a text from Norwegian into English, and wonder if the following sentences are OK:

"The earliest known written observation that apoplexy, lethargy or other serious brain diseases may lead to damage of speech without a synchronous paralysis of the tongue, is found in a letter from the German doctor Atheus to a Swiss colleague, Schenkius, in 1585."

"Even if aphasia is a linguistic phenomena, the study of aphasia has until recently been dealt with largely by neurologists and psychologists, not linguistics."