Yes, however the sentence order changes the stress in Turkish. Normally the sentence element that is closest to the predicate (action word) is stressed. When the predicate is before the subject, the predicate is stressed.
So in "Kumsaldalar kızlar", kumsal (where they are) is stressed. They are at THE BEACH, not anywhere else.
"Kızlar kumsaldalar." The girls are at the beach.
Plural pronouns do not require verb conjugation.
You can use third person plural on verbs for actions taken by humans, however "Kızlar kumsalda" is also correct.
Kumsaldalar -> The extra, "-lar" means there are lots of girls at the Beach & it is optional.