Learn Arabic (Modern Standard): نشرت المجلات المحلية الصور الجميلة. - The local magazines published the beautiful pictures.

In Arabic, plural nouns that do not refer to humans are treated as feminine singular for grammar purposes. Since المجلات (the magazines) is a non-human plural, the verb must be in the feminine singular form (نشرت), as if saying "she published".

Why is the adjective for "local" (المحلية) in the singular form, even though "magazines" is plural?

This is another example of the non-human plural rule. Because المجلات is a non-human plural, any adjective describing it must also be feminine singular. That is why we use المحلية instead of a plural adjective.

Does this non-human plural rule apply to the object of the sentence too?

Yes! الصور (the pictures) is also a non-human plural. Therefore, the adjective describing them, الجميلة (the beautiful), must be in the feminine singular form too.

Why do both words in الصور الجميلة have ال attached to them?

In Arabic, an adjective must match the noun it describes in being definite (having "the") or indefinite. Since we are talking about specific pictures (الصور), the adjective must also take the word "the" (الجميلة).

Why does the verb نشرت come at the very beginning of the sentence?