Många ställer upp och hjälper till med insamlingen.

Here Många means many people.

In Swedish, många can stand on its own without a noun if the noun is understood from context. So:

• Många ställer upp = Many people volunteer / step up
• Literally, många just means many

This is very common in Swedish.

Ställa upp is a very common Swedish particle verb, and its meaning depends on context. Here it means something like:

• to volunteer
• to step up
• to be willing to help
• to show up and take part

So Många ställer upp suggests that many people are willingly joining in to help.

It does not mean the literal set up here, even though ställa by itself often means to put/place/stand.

Because ställa upp is a particle verb.

In Swedish, many verbs are made of:

• a main verb
• plus a small word such as upp, ut, av, på, etc.

In main clauses, that small word is often written separately:

• Jag ställer upp
• Hon hjälper till

But in some other forms, the particle can stay attached in compounds or related nouns, depending on the word. The important thing here is that ställer upp should be learned together as one expression in meaning, even though it is written as two words.

Hjälpa till means to help out.

So:

• hjälpa = help
• hjälpa till = help out / lend a hand

The version with till often sounds a bit more natural when talking about joining in and contributing to some activity.

So:

• Många hjälper med insamlingen would sound less natural
• Många hjälper till med insamlingen is the normal phrasing

Yes, they are close in meaning, but they add slightly different shades:

• ställer upp = step up / volunteer / be willing to participate
• hjälper till = help out in practice

Together, they give a fuller sense:

• people are not only willing to join
• they are also actively helping

So the sentence sounds a bit like: Many people step up and help out with the collection.

Med insamlingen means with the collection or with the fundraising effort, depending on context.

• med = with
• insamlingen = the collection / the fundraiser / the fundraising drive

In Swedish, insamling often refers to collecting money, items, or donations for a cause.

So hjälper till med insamlingen means helping with that activity.

Because insamlingen is the definite form, meaning the collection.

Swedish marks definiteness mainly by adding an ending to the noun:

• en insamling = a collection
• insamlingen = the collection

Using insamlingen suggests that the collection is already known from the context, or that it is a specific one the speaker has in mind.

In modern Swedish, verbs do not change according to the subject.

So the same present-tense form is used with:

• jag ställer upp
• du ställer upp
• han/hon ställer upp
• vi ställer upp
• de ställer upp

That is why Många ställer upp uses the same verb form regardless of who is doing the action.

It is in the present tense:

• ställer
• hjälper

In Swedish, the present tense can be used for:

• something happening now
• something that happens regularly
• a general statement

So this sentence could mean:

• Many people are stepping up and helping with the collection
• or Many people step up and help with the collection

The exact English translation depends on context.

Yes. The subject Många belongs to both verbs.

So the structure is:

• Många = subject
• ställer upp = first verb phrase
• och hjälper till med insamlingen = second verb phrase

In other words:

• Many people step up
• and (many people) help out with the collection

Swedish often leaves the subject unstated in the second part when it is the same as in the first part.

Yes, med is the natural choice here.

• hjälpa till med något = help out with something

Examples:

• hjälpa till med maten = help with the food
• hjälpa till med städningen = help with the cleaning
• hjälpa till med insamlingen = help with the collection

So med is the standard preposition in this pattern.