The formal explanatory ending のである — the written-register equivalent of のだ/んです. Marks the sentence as providing an explanation, background, or significant fact. Common in literary prose, journalism, and academic writing.
5 sentences
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Because she had grown romantic, she had not yet fallen into the kind of passive frame of mind that accepts the idea that, wherever a person is, they should find some little corner to live in and arrange their whole life around it.
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She shut herself in the study and cried her heart out.
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What at first glance seems perfectly ordinary is, in fact, actually difficult.
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Someone who can't do that is just plain unfit for the top spot.
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She wished for a more relaxed life, but in those circumstances it was impossible.