Grammar

Is the below underlined grammatical or ungrammatical?

Originally, it was

" It confirmed his suspicion of the dog being diabetic as he found sugar in its urine."

Would the meaning be slightly changed, too?

It was only in 1919 when Dr. Oscar Minkowski and Dr. Joseph Merring got the first clue to the cause of diabetes. While trying to find out the possible causes of diabetes they came to a conclusion that the pancreas plays some role in causing diabetes. To confirm their finding they decided to remove the pancreas of a dog to study the after-effects on the dog. After removing the pancreas of the dog they noticed that the dog was urinating excessively. When Dr. Minkowski noticed a bunch of flies gathered on the urine he suspected the dog was diabetic and to confirm his suspicion he tested the dog’s urine for sugar. It confirmed his suspicion of the dog to be diabetic as he found sugar in its urine. This finding finally linked diabetes to the pancreas.