De când caută chilipiruri, Ana vine în fiecare sâmbătă.

It introduces a time clause. Here de când means since / ever since and gives the starting point for the situation in the main clause.

So De când caută chilipiruri is not the main statement by itself; it sets the time frame for Ana vine în fiecare sâmbătă.

No. In Romanian, de când is temporal, not causal.

If you want because, Romanian normally uses pentru că, fiindcă, or deoarece. English since can be ambiguous, but Romanian de când is much more clearly about time.

Romanian often leaves out subject pronouns because the verb form already shows the person and number.

Caută means he/she looks / is looking, so a separate word for she is not necessary. In this sentence, the natural reading is that the understood subject is Ana, even though her name appears in the main clause.

Romanian often uses the present tense after de când where English might prefer a present perfect or present perfect continuous.

So caută can describe something that started earlier and is still true or still relevant now. Meanwhile, vine is a habitual present: it shows a repeated action, not a one-time event happening right this second.

That is why English may naturally use forms like has been looking and comes / has been coming, even though Romanian keeps the present.

Chilipiruri is the plural of chilipir. It is an indefinite direct object, so Romanian uses the bare plural here, just as English says bargains rather than the bargains.

So caută chilipiruri means she is looking for bargains in general. If you said chilipirurile, that would mean specific bargains already known from the context.

After fiecare, Romanian normally uses the singular noun.

So fiecare sâmbătă works like each Saturday, and the whole expression means every Saturday. The preposition în is part of the time expression here.

Because De când caută chilipiruri is a subordinate clause placed before the main clause.

In Romanian, when that kind of opening clause comes first, it is normally separated from the main clause with a comma. If you reverse the order, you would usually write Ana vine în fiecare sâmbătă de când caută chilipiruri without that comma.

Yes. Romanian allows both:

• De când caută chilipiruri, Ana vine în fiecare sâmbătă.
• Ana vine în fiecare sâmbătă de când caută chilipiruri.

The difference is mainly one of focus. Starting with De când... highlights the time frame first; starting with Ana vine... puts the main statement first.