Grammar - I am a student and I want know clearly the two main kinds of sentences?

...Dani decided to disagree with his fathers decision but he must fulfill it.Is it a correct compound sentence? Second question U.S government legal

...Dani decided to disagree with his father's decision but he must fulfill it.Is it a correct compound sentence?
Second question
U.S government legalise the use of gun for everyone who has a licence because the right to self defense. Is it a correct complex sentence?

or:...Dani decided to disagree with his father's decision but he must fulfill it.Is it a correct compound sentence? Second question U.S government legalise the use of gun for everyone who has a licence because the right to self defense. Is it a correct complex sentence?

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