Complex sentence: William Beetham (25 July 1809--3 August 1888) was an English-born portrait painter and following his immigration to New Zealand, he became particularly prominent as a colonist, pastoralist and portrait artist.
Split into simpler sentences: William Beetham (25 July 1809--3 August 1888) was an English-born portrait painter. He immigrated into New Zealand and became particularly prominent as a colonist, pastoralist and portrait artist.