Japanese と相まって: factors acting together

Use と相まって when two circumstances combine to produce an effect. It often appears in formal writing.

The idea

In A が B と相まって、C, A combines with the noun B; C describes their resulting effect. Both favorable and unfavorable results are possible.

円安えんやすが物価ぶっか上昇じょうしょうと相あいまって、家計かけいを圧迫あっぱくしています。The weak yen, combined with rising prices, is squeezing household budgets.
暖あたたかい天候てんこうが週末しゅうまつと相あいまって、公園こうえんは大勢おおぜいの人ひとでにぎわいました。The warm weather, combined with the weekend, brought crowds to the park.
彼女かのじょの経験けいけんが努力どりょくと相あいまって、事業じぎょうを成功せいこうに導みちびきました。Her experience, combined with her effort, led the business to success.
人口じんこう減少げんしょうが高齢化こうれいかと相あいまって、地域ちいきの交通こうつうを支ささえることが難むずかしくなっています。Population decline, combined with aging, is making local transport harder to sustain.
この音楽おんがくは美うつくしい映像えいぞうと相あいまって、深ふかい感動かんどうを生うみます。This music, combined with the beautiful images, creates a deeply moving effect.
雨あめが強つよい風かぜと相あいまって、作業さぎょうは困難こんなんになりました。The rain, combined with strong winds, made the work difficult.

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This is more than a list: the factors jointly contribute to C. It is not the everyday と used simply to join nouns.

雨あめが風かぜ＿＿、作業さぎょうが難むずかしくなりました。
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と相まって
と相まって — Rain combines with wind to make work difficult.
経験けいけんが努力どりょく＿＿、成功せいこうに導みちびきました。
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と相まって
と相まって — Experience and effort together lead to success.
物価ぶっか上昇じょうしょうが円安えんやす＿＿、家計かけいを圧迫あっぱくしています。
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と相まって
と相まって — Rising prices and a weak yen jointly pressure household budgets.

Describe a local change caused by two factors, and explain the resulting effect.