The revised sentence is:
"Leaving school on time is important because we need to arrive at the game before it starts, and we also need time to warm up."
Changes Made:
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Changed "to leave" to "Leaving": This correction switches from the infinitive form ("to leave") to the gerund form ("Leaving"). Using the gerund form makes the subject of the sentence clearer and gives it a more fluid structure.
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Replaced "us having to make it" with "we need to arrive": This change improves clarity and conciseness. The original phrasing was awkward and unnecessarily complex, while "we need to arrive" is straightforward and directly conveys the message.
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Added an "and": Inserting "and" before "we also need time to warm up" creates a smoother transition between the two related ideas, emphasizing that both arriving on time and warming up are important.
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Added a comma: The comma before "and" is used here to separate the two independent clauses and enhance readability.
These changes improve the grammatical structure and clarity of the sentence while making it easier to read and understand.