Complex sentence: Macewen was its first chief surgeon and he designed the Erskine artificial limb with the help of engineers and workers of the nearby Strathclyde shipyards, and trained a team of pattern-makers to manufacture them for the hospital.
Split into simpler sentences: Macewen was its first chief surgeon and with the help of engineers and workers of the nearby Clydeside shipyards, he designed the Erskine artificial limb. He trained a team of pattern-makers to manufacture them for the hospital.