Answer:
Fragment
Correct sentence: 'The study of French requires patience because the grammar rules are different from those of the English language.'
Step-by-step explanation:
A fragment is defined as a 'part broken off or detached from a sentence that expresses an incomplete thought.' The given sentence exemplifies a fragment as it unncessarily employs a full stop(.) in the middle of a complex sentence which misleads the overall meaning of the sentence. In order to rectify this error, the full stop can be removed so that the dependent clause 'because...language' accomplishes its meaning by linking with the principal clause.