、。
As dinnertime arrives, the cabin crew begins serving dinner.
Literal
Dinner-of time [become-になり], cabin-crew-members [subject-が] dinner [object-を] bring-out-begin-[polite-ます].
Aviation/flight register. 時間になる ('to become time for') is the standard fixed phrase for a scheduled time arriving. 客室乗務員 (きゃくしつじょうむいん) is the formal term for cabin crew / flight attendants — 客室 (passenger cabin) + 乗務員 (crew member). 出し始める is a compound: 出す ('to put out, serve') + 始める ('to begin') — 'begin serving.'