In hoc nemore lente ambulatur, quia frutices densiores sunt.

Because in takes the ablative when it means in, on, inside, within a place.

• nemus, nemoris = grove
• ablative singular = nemore
• hoc must match nemore in case, number, and gender, so it is also ablative singular neuter

So:

• in hoc nemore = in this grove

If the idea were movement into the grove, Latin would normally use in + accusative instead.

Ambulatur is the 3rd person singular present passive of ambulare.

But this is a special Latin usage: ambulare is an intransitive verb, so its passive is often used impersonally.

So ambulatur does not mean a normal passive like he is walked. Instead, it means something like:

• people walk
• one walks
• there is walking

In this sentence, lente ambulatur means people walk slowly or one walks slowly.

Because the impersonal passive in Latin is normally always 3rd person singular.

There is no stated subject such as people or they. Latin leaves the subject indefinite, and the verb stays singular:

• ambulatur = one walks / people walk
• pugnatur = people fight / there is fighting
• curritur = people run / one runs

So the singular form is exactly what you should expect.

Because lente is an adverb, not an adjective.

• lentus, lenta, lentum = slow
• lente = slowly

It describes how the walking happens, so Latin uses the adverb:

• lente ambulatur = one walks slowly

If it were an adjective, it would have to describe a noun and agree with it. But here there is no noun being described by slow.

Frutices is the nominative plural of frutex, fruticis, meaning bush or shrub.

In this sentence, frutices is the subject of sunt:

• frutices densiores sunt = the bushes are denser / the bushes are rather dense

So even if English might use bushes in a more general way, Latin is using a clear nominative plural subject here.

Densiores is the comparative adjective from densus:

• densus = dense, thick
• densior = denser, thicker

It agrees with frutices, which is masculine nominative plural, so the adjective must also be nominative plural:

• frutices densiores

The comparative forms for masculine and feminine often look the same, so densiores is the expected form here.

Latin often uses a comparative without stating the second thing being compared.

So densiores can mean:

• denser
• rather dense
• too dense, depending on context
• denser than usual / than elsewhere, with the comparison understood

A learner often expects an explicit comparison like denser than the bushes in another grove, but Latin does not always need to say that.

So frutices densiores sunt is perfectly normal even without quam.

Latin word order is much more flexible than English word order because the endings show how words function.

This sentence is arranged in a very natural Latin way:

• In hoc nemore sets the scene first
• lente comes before the verb to show the manner
• ambulatur gives the main action
• quia introduces the reason
• frutices densiores sunt gives the explanation

So the order is not random; it helps the sentence flow in a clear Latin style. English depends much more on position, but Latin depends more on endings.

Quia means because and introduces a clause giving the reason.

So the sentence has two parts:

• main statement: In hoc nemore lente ambulatur
• reason: quia frutices densiores sunt

That is, because the bushes are denser / rather dense.

It works very much like English because.