It was the first profits warning Apple has made since it launched the iPhone, a product that propelled the company into the top tier of tech companies and briefly made it the most valuable company in history.

【翻译】这是苹果自推出iPhone 以来首次发布利润预告。iPhone 是推动该公司跻身顶级科技公司之列的一款产品，并一度使其成为历史上最有价值的公司。

【分析】

It （主语）was （系动词）the first profits warning （表语）Apple has made since it launched the iPhone（定语从句，修饰warning。其中since 从句是has made 的时间状语）， a product （iPhone 的同位语）that propelled the company into the top tier of tech companies and briefly made it the most valuable company in history.（定语从句，修饰product，其中propelled 和 made 是并列谓语动词）