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It's grammatically correct, but I would not use the word "generalisable." after having just used "generalisability." I would write this:
"The findings lack in generalisability because they may not be applicable to left-handed individuals since the sample consisted of right-handed people only."
Or
This seems unnecessarily wordy to me. I'd consider
eg "One cannot generalize from the findings, since the sample consisted of right-handed people only."