What do you to understand by sentence transformation (function)?Gibe example​

Does anyone read this story in 9th grade "when mr. pirzada came to dine"

If one writes logically, he will prove his point. is this sentence correct or contains an unwarranted shift in person?

3. what is the purpose of a lead sentence or paragraph? to display your most convincing reasons and arguments to you revise the overall structure of your work to interest readers and introduce your writing style to add details and elaborate on your ideas