活発になっているんですよ
kappatsu ni natte iru n desu yo
JA
It's getting lively/active, you know.
最近、この街は活発になっているんですよ。
This town has been getting more lively lately, you know.
Etymology
活発 (kappatsu) comes from Chinese characters meaning 'lively' and 'vigorous', with the grammatical forms に (adverbial marker), なっている (progressive form of 'to become'), んですよ (polite explanatory particle phrase common in casual speech).
Memory Aid
Break it down: 活発 means 'active', に turns it to an adverb, なっている means 'has become', and んですよ adds a friendly conversational tone.
Related Words
活発元気にぎやか