Complex sentence: Kerr served in the South African government from 1905 to 1910 and was a member of what was called "Milner's Kindergarten", a group of colonial officers who deemed themselves reformist rather than an actual political faction.
Split into simpler sentences: Kerr served in the South African government from 1905 to 1910 and was a member of what was called "Milner's Kindergarten". This was a group of colonial officers who deemed themselves reformist rather than an actual political faction.