Complex sentence: In 1647, he was commissioner for sewers for Lincolnshire and Northamptonshire, was commissioner for assessment for Westminster in 1648 and commissioner for assessment for Middlesex in 1648 and 1649.
Split into simpler sentences: In 1647, he was commissioner for sewers for Lincolnshire and Northamptonshire. He was commissioner for assessment for Westminster in 1648 and commissioner for assessment for Middlesex in 1648 and 1649.