La kolektejo ricevis tiom da ladskatoloj kiom da rubsakoj.

Tiom ... kiom is the standard Esperanto pattern for comparing amounts or numbers.

• tiom da X = that many / that much X
• kiom da Y = as many / as much Y

So tiom da ladskatoloj kiom da rubsakoj means the number of cans was equal to the number of trash bags.

This is specifically for quantity comparison. It is different from patterns like:

• tiel ... kiel for degree or manner
• same ... kiel style meanings are expressed differently in Esperanto

So here kiom is used because the sentence compares how many things there were.

Because kiom is used for quantity.

A very useful distinction is:

• kiom = how much / how many
• kiel = how / in what way / like

Since the sentence is about the number of cans and trash bags, Esperanto uses kiom.

Compare:

• Tiom da pomoj kiom da piroj = as many apples as pears
• Li faris tion tiel kiel vi = he did that the way you did

So in your sentence, kiel would be the wrong word.

Because both sides of the comparison are quantity phrases.

• tiom da ladskatoloj = so many cans
• kiom da rubsakoj = as many trash bags

In Esperanto, da is used after words of quantity to link them to the noun being counted or measured.

So:

• multe da akvo = a lot of water
• kelkaj does not use da
• tiom da ladskatoloj does use da

Since both tiom and kiom are quantity words here, both need da.

This is a very common question.

In a phrase with da, the noun after da normally does not take the accusative -n.

So Esperanto says:

• Mi aĉetis multe da libroj
• La kolektejo ricevis tiom da ladskatoloj kiom da rubsakoj

not:

• multe da librojn
• tiom da ladskatolojn

The idea is that da creates a quantity expression, and the noun after da stays in its basic form.

So even though the whole phrase functions as the object of ricevis, the noun after da does not get -n.

Because ladskatolo is a countable noun, and the sentence is talking about multiple cans.

In Esperanto:

• singular noun ending: -o
• plural noun ending: -oj

So:

• ladskatolo = one can
• ladskatoloj = cans

The same applies to:

• rubsako = one trash bag
• rubsakoj = trash bags

After da, Esperanto often still uses the plural when the noun is countable and the meaning is multiple items.

It is built from parts:

• kolekti = to collect
• -ej- = place for something
• -o = noun ending

So kolektejo literally means a place for collecting.

Depending on context, it could be translated as something like:

• collection point
• collection center
• recycling drop-off place

This is a very common Esperanto word-building pattern. For example:

• lerni = to learn
• lernejo = school, literally a place for learning

They are compounds, which Esperanto uses a lot.

ladskatoloj

• lado = sheet metal / tinplate
• skatolo = box
• ladskatolo = can / tin
• ladskatoloj = cans

rubsakoj

• rubo = trash / garbage
• sako = bag
• rubsako = trash bag
• rubsakoj = trash bags

Esperanto often combines roots very directly, so once you know the parts, long words become much easier to understand.

La is the definite article, like the in English.

It appears before kolektejo because the speaker is referring to a specific collection place: the collection center.

But ladskatoloj and rubsakoj appear inside quantity expressions:

• tiom da ladskatoloj
• kiom da rubsakoj

These mean something like so many cans and as many trash bags, not the cans or the trash bags. They are being mentioned as quantities, not as specific already-identified groups.

So leaving out la is normal here.

Ricevis is the past tense form of ricevi.

• ricevi = to receive
• ricevas = receives / is receiving
• ricevis = received
• ricevos = will receive

So the ending -is tells you the action happened in the past.

This is one of the easiest and most regular parts of Esperanto grammar: verb tense endings never change for person.

Not exactly an omitted full clause, but there is an understood comparison.

The sentence means that the number of cans received was equal to the number of trash bags received or present in the comparison context. Esperanto often leaves that second part compressed, just like English does in sentences such as:

• I bought as many apples as pears.

That does not need a second verb like I bought as many apples as I bought pears unless you want extra emphasis or clarity.

So kiom da rubsakoj is a natural shortened comparison phrase.

Yes. Esperanto allows a few other ways to express the same basic idea.

For example:

• La kolektejo ricevis same multe da ladskatoloj kiel da rubsakoj.
• La kolektejo ricevis egalan nombron da ladskatoloj kaj rubsakoj.

But tiom da ... kiom da ... is very standard and straightforward when comparing equal quantities.

So the original sentence is completely normal Esperanto.