Question

my father works all day long to earn money. (simple to complex)​

Answer 1

my father works all day long so that he can earn money

Answer 2

Complex : my father works all day long so that he can earn money.

'So' is a subordinating conjunction which makes the sentence complex.

To make it compound, use a co ordinating conjunction

Compound : my father works all day long for earning money.

Hope this helps

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