你应该是不太明白复合句与简单句的区别。
由一个主句和一个或一个以上的从句构成的句子叫复合句。
1.The singer began to learn singing when she was five.这个句子中when she was five是个时间状语从句，意思就是要你将这个句子变成不含从句的简单句。
就是将有引导词引导的从句，变成一个简单的句子呗。
The singer began to learn singing at the age of five.
The singer began to learn singing at the age of five
意思跟上面一样 这个歌手5岁的时候开始学习唱歌
把时间状语换种表达方法，不用从句，用短语或其他单词表达。
At the age of 5,the singer began to learn singing.
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