Can anyone give me an example of independent sentences that don't use a noun at the beginning?

i've been stuck in the mindset of that i always need to have a comma somewhere when there's a sentence that doesn't start with a noun. i'd like some examples of some, and if you can, to give it's term like for ex:
["presumably he had nothing on his mind."/prepositional phrase]

the correct answer is d. in john paston's letter written friday, 14, 1476, he expresses his fear that he may have to go to war.

indeed, although the black death was ravaging europe, the pastons were relatively safe from it due to their social status as they were part of the landed gentry. it is clear that the vast majority of the victims of the pandemic were the poor. the reason why he is weary of having to go to war is because at the particular time england was also devastated by the war of the roses and paston, being a courtesan was inevitably involved.

i think descriptive but i'm not 100% sure.. sorry.

question:

write a 1500-word historical investigation report. use exposition, narration, description, argumentation or some combination writing to support the main proposition. you will give this report orally.

there's many interesting events that have occurred over the course of humanity's existence. off the top of my head, you could discuss the cold war; the world wars (1 & 2); american civil rights movements; the russian or french revolutions. world war ii has ended. you are the leader of a great superpower—one of two   in the world. to keep the balance of power in your nation’s favor, you want to   gain as many allies as possible. you are particularly interested in gaining the   support of nations in africa, asia, and central and south america who do not   yet favor either superpower.   you call your advisers together to develop policies for making uncommin.

hope this !