Complex sentence: He was a governor of Ha'apai and Keeper of Public Records from 1948-1953, than from 1950-1968, he became the Secretary of Traditions Committee in Tonga.
Split into simpler sentences: He was a governor of Ha'apai from 1948-1953. From 1948-1953, he was the Public Keeper of the Records, than from 1950-1968, he became the Secretary of Traditions Committee in Tonga.