notadictionary.com
会社から電話かかってきて何事かと思ったら…
→ “I got a call from the office, and I thought something was wrong...”
会社 kaisha = company / corporation (noun)
から kara = from (particle indicating source/origin)
電話 denwa = telephone / phone call (noun)
かかって kakatte = coming / arriving (v. stem of kakaru)
きて kite = and then / while doing (conjunctive form of kuru)
何事 nanigoto = what's the matter? / what happened? (noun phrase)
何 nani = what
事 goto = matter / thing
かと ka to = whether... or not (thought particle combination)
思ったら omotara = when I thought / after thinking (conditional form of omou)
… = ellipsis (indicates trailing off/thought unfinished)
