Complex sentence: In 1764 Battishill was appointed organist of the united parishes of St Clement Eastcheap and St Martin Orgar, and in 1767 of Christ Church, Newgate Street, holding both posts until his death in 1801.
Split into simpler sentences: In 1764 Battishill was appointed organist of St Clement Eastcheap, which had recently united with the parish at St Martin Orgar. Three years later he became organist at Christ Church, Newgate Street as well and served at both St Clement and Christ Church until his death in 1801.