Complex sentence: The area was transferred from Middlesex to the County of London in 1889 and the local government of Westminster was reformed in 1900 when the court of burgesses and parish vestries were abolished, to be replaced with a metropolitan borough council.
Split into simpler sentences: The area was transferred frpm Middlesex to the County of London in 1889. The local government of Westminster was reformed in 1900 when the court of burgesses and parish vestries were abolished, to be replaced with a metropolitan borough council.