Sentence outlines tend to help with grammar. They help you organize clauses to figure out internal punctuation such as commas or semicolons. They also help you make sure you have a completed thought.
Mary Jackson prepared an assignment but John Becker was not ready to approve the result of the assignment which led to the disagreement between them.
It became evident later that John Becker had the wrong input data which made him the wrong party in the disagreement.
