A run-on sentence usually occurs when two separate sentences or clauses are improperly combined. However, unlike sentence fragments, run-on sentences can still be technically grammatically correct. So technically the are bad.
The boy was no larger taller than five feet, and his smooth, youthful face was now covered in tomato sauce from the plate that lay shattered on the floor. he couldn't have been older than ten, with his batman t-shirt and ruffled brown hair that were both doused in italian fare.
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