Complex sentence: George Augustus Robinson (22 March 1791--1866) was a builder and untrained Preacher called upon to mount a "friendly mission" to find the 300 remaining aboriginals in Tasmania.
Split into simpler sentences: George Augustus Robinson (22 March 1791--1866) was a builder and untrained Preacher. In this role he was called upon to mount a "friendly mission" to find the 300 remaining aboriginals in Tasmania.