。
My kids will be on spring break soon.
Literal
My children-[plural-達] [topic-は] soon spring-break is-[polite-です].
A textbook-simple sentence. 子供達 uses the plural suffix ~達 for 'children, kids.' もうすぐ ('soon, almost') is a standard adverb. The noun-predicate 春休みです ('is spring break') equates the kids with their upcoming state — a characteristic Japanese construction where the topic is linked directly to a temporal state without a verb like 'will have.'