Complex sentence: In 1913 the engine room was extended to the east and a new chimney stack was built, in 1919 a second chimney stack was erected and in 1922 a second floor was added to the office block.
Split into simpler sentences: In 1913 the engine room was extended to the east and a new chimney stack was built. In 1919 a second chimney stack was erected and in 1922 a second floor was added to the office block.