Sentence connectors

[Sanjay]

Dear Alan,
In the example below
He is a busy man. At 5 a.m, he gets up to start his day
He is coming today. Tomorrow, he will attend a meeting .
He is young and therefore,strong.

1.Will "at 5 a.m" be a sentence connector?
2.will "Tomorrow "be a sentence connector?
3. Is it correct to use 'and"(co-ordinate conjunction used as connector) & "therefore" (Conjunctive adverb used as connector ) together?
4.What will the combined entity(co-ordinate conj and Conjunctive adverb) be called in the above sentence?
Warm regards

[Alan]

1. No.
2. No
3. Yes.
4. Since it is not a phrase of any kind, it has no particular name....