Complex sentence: Concerned about Overton's competence, Pease asked George Stephenson to meet him in Darlington, and by 23 July George had been appointed to make a fresh survey of the line.
Split into simpler sentences: Concerned about Overton's competence, Pease asked George Stephenson to meet him in Darlington. By 23 July George had been appointed to make a fresh survey of the line.