Complex sentence: Smeaton made a survey of the river and produced a report in 1766, in which he recorded that there were 18 staunches at the time, with a lock at Ware and tidal gates at Bow.
Split into simpler sentences: Smeaton made a survey of the river and produced a report in 1766. He recorded that there were 18 staunches at the time, with a lock at Ware and tidal gates at Bow.