vorkommen
to occur
To exist or be found in a certain place or under certain conditions.
Diese seltene Pflanzenart kommt nur in den Alpen vor.
This rare plant species occurs only in the Alps.

to occur / seem
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to occur
To exist or be found in a certain place or under certain conditions.
Diese seltene Pflanzenart kommt nur in den Alpen vor.
This rare plant species occurs only in the Alps.

'Vorkommen' is a separable verb. In a main clause, the prefix 'vor' goes at the end. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Solche Fehler kommen in seinen Texten häufig vor.
Such errors frequently occur in his texts.
In the meaning of 'erscheinen' (to appear) or 'wirken' (to seem), 'vorkommen' always needs a person in the dative. The pattern is: Something (subject) comes someone (dative) [adjective] before.
Die ganze Situation kam mir sehr seltsam vor.
The whole situation seemed very strange to me.
When 'vorkommen' has the meaning 'passieren' (to happen), it is often combined with the impersonal subject 'es' and a 'dass' clause. The structure is: Es kommt vor, dass ... (It happens that ...).
Es kommt selten vor, dass ich so früh aufstehe.
It rarely occurs that I get up so early.
In the meaning of 'existieren' (to exist), 'vorkommen' is often used for things that can be found in nature or in a system. Typical subjects are animal and plant species, minerals, but also words or errors in a text.
Wölfe kommen in dieser Region wieder häufiger vor.
Wolves are occurring more frequently again in this region.
to come
'kommen' and 'vorkommen' can both mean that something happens. 'kommen' is very general and is often used in fixed expressions, for example 'es kommt zu einem Problem' (a problem occurs). 'vorkommen' fits well when you say that something happens sometimes or is possible in a situation. The risk of confusion is that both have to do with events. A practical guide: 'Es kommt zu ...' often describes an event occurring, while 'Das kommt vor' means more like: Things like that happen sometimes.

Solche Fehler kommen am Anfang eines Kurses oft vor.
Mistakes like this often happen at the beginning of a course.
Bei der Anmeldung kann es zu längeren Wartezeiten kommen.
There may be longer waiting times during registration.