K5 Learning describes what run-on sentences are and how to fix them.
Run On Sentences online worksheet
Run-on Sentences - Examples, How to Spot
Complete, Fragment, Run-On Sentence Sort, Set 2 Run on sentences, Sentence activities, Writing lessons
Run-On Sentences and Comma Splices
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Run-On Sentences - BrainPOP
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Run-On Sentences Worksheets
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What are Run-on Sentences?
Run-on Sentences: Grammar Practice Page
Grammar & Complete Sentences Intervention Workbook Level 3: Fixing