Learn Turkish: Daha çok sosyalleşseler sıkıcı rutinlerini değiştirirler. - If they socialized more, they would change their boring routines.

It uses the conditional suffix -se attached directly to the verb stem sosyalleş-, followed by the plural personal suffix -ler. Adding -sa or -se right onto a verb stem creates a present hypothetical situation, meaning "if they were to socialize" or "if they socialized."

Why is değiştirirler in the aorist (simple present) tense if the translation says "they would change"?

In Turkish present hypothetical sentences, the main clause typically uses the aorist tense (-ir, -ar, -er) to express "would." So, while the aorist usually means "they change" in a general sense, when paired with an -se if-clause, değiştirirler translates to "they would change."

Can you break down the suffixes on rutinlerini?

It breaks down as rutin (routine) + -leri (their, possessive suffix) + -n- (buffer letter) + -i (accusative case suffix). The accusative -i is required because "their routines" is a specific direct object receiving the action of the verb değiştirirler.

Why use değiştirmek here instead of değişmek?