How does Title Case decide what to capitalize?

It capitalizes the first letter of every word, which suits most headings — it doesn't apply style-guide exceptions for short words like "a" or "the".

Does Sentence case fix multiple sentences at once?

Yes — it capitalizes the first letter after every period, question mark or exclamation point, in addition to the very start of the text.

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Result

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG

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