Complex sentence: In the 1870's Horne took on assistants Charles Rennels Hancock and Alfred Granby Winsor and in 1874 he was chosen from a field of twelve architects to design and supervise the building of St John's Church, Ealing Dean.
Split into simpler sentences: In the 1870's he took on assistants Charles Rennels Hancock and Alfred Granby Winsor. In 1874 he was chosen from a field of twelve architects to design and supervise the building of St John's Church, Ealing Dean.