Take the pizza out of the oven. Then let it cool. ➡The word 'then' is an adverb; it cannot join two independent clauses.
The main reason why the leader of this country needs to be replaced immediately is obvious.
Complete sentence. ➡This sentence has a long subject ("The main reason.....immediately") but the subject is followed by a verb (is). This makes it complete.
The student had tried to cheat on the test. Although, he was not successful.
Fragment ➡'However, he was not successful' because the word 'however' is not a conjunction (it is an adverb).
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