The bag--one of the simplest and most useful things in every
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定语从句:

1.Then,things (you bought )were wrapped in plain brown paper,or sometimes in old newspapers.

2.The bag--one of the simplest and most useful things in every man or woman's life--has given the world many strange expressions (that are not very simple)

过去分词做前置定语:

(Another widely used )expression is "to let the cat out of the bag",meaning to reveal a well-kept secret.

倒装句:

When the dishonest tradesman opened the bag,out jumped a squealing cat ,not a pig.

本人自己做的,如有错误,请原谅