ive sb sth to do sth 中的不定式在句子中作宾补：

give sb sth——动词后面接双宾语

give sb sth to do sth：不定式在句子中作宾补，补充说明 sb

He gave me some money to buy food.

比较：He gave me some money and I buy food with the money.

Agriculture gave people their first experience of the power of technology to change lives.

比较：Agriculture gave people their first experience of the power of technology and people change lives with their first experience of the power of technology.