Learn Farsi: خیاط هم قیچی خرید هم سوزن. - The tailor bought both scissors and needles.

While Farsi normally puts the verb at the very end of the sentence, correlative conjunctions like ham... ham... (both... and...) often bend this rule. It is very natural in everyday Farsi to place the verb after the first object (ham qeychi kharid) and add the second object afterward (ham soozan). You could also put both objects together before the verb (khayât ham qeychi ham soozan kharid), but the split version flows nicely and is very common.

The English translation says "needles", so why doesn't soozan have the plural ending -hâ?

When Farsi speakers talk about a generic category of items being bought, used, or consumed, they often leave the noun in its singular form. Because the tailor is just buying "needles" in a general, unspecified sense, soozan doesn't need to be pluralized. The English translation naturally uses the plural so it sounds correct in English.

Is the word qeychi treated as a plural noun in Farsi, like "scissors" is in English?

No, in Farsi, qeychi is a singular noun representing one tool (a pair of scissors). Unlike English, which treats "scissors" or "pants" as grammatically plural, Farsi treats them like any regular singular object. If you wanted to talk about several distinct pairs of scissors, you could say qeychihâ, but here it acts as a generic, singular category.