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Then, how do you use since then in a sentence?

since then in a sentence

1. Since then it has progressively reduced its exposure to currency fluctuations.
2. There could have been other circumstances that have occurred since then.
3. Since then his image has been through a number of updates.
4. The key event since then has been the war in Chechnya.

Subsequently, question is, does Since include the date? 'Since' is used to refer to when something began or started; the action may continue to the present, but it also may have stopped. 'Since' is always used with a specific time, date, or age (7:00pm, January, or 5-years-old, prehistoric time).

In respect to this, what comes after since?

We use the Past tense after “since” when we refer to a point in time in the past, and we use the Present Perfect after “since” when we refer to a period of time from the past until the present.

Do I need a comma after since then?

My only suggestion is that if you are going to begin a sentence with the phrase "ever since" or "since then", you should use a comma after the phrase.