No, the given sentence is not a run-on sentence. It is a complete sentence, but it seems to contain a typographical error as the word "too" is likely meant to be "hard" or "difficult".
No, the sentence you provided is not a run-on sentence. A run-on sentence is a sentence that improperly joins two or more independent clauses without proper punctuation or conjunctions. Your sentence is a fragment and lacks a subject, verb, and proper punctuation, but it is not a run-on sentence.
