보관해오다가

보관해오다가

"To have been storing or keeping."

In this sentence, '보관해오다가' is used to indicate the process of keeping and preserving over time, then transitioning to an action—donating.

저는 오랜 세월 동안 이 고서를 보관해오다가 결국 박물관에 기증했습니다.

I kept this ancient book for a long time and eventually donated it to the museum.

Here, '보관해오다가' describes the act of holding and preserving heirlooms followed by an act involving these items—revealing.

그는 그의 할머니의 유품을 보관해오다가 최근 가족들에게 공개했습니다.

He kept his grandmother's heirlooms and recently revealed them to his family.

'보관해오다가' in this example conveys the action of maintaining data storage over time and then moving to a new system to handle it.

그 회사는 고객의 데이터를 보관해오다가 새로운 시스템으로 이전했습니다.

The company kept the customer data and transitioned it into a new system.