Complex sentence: West Derby once had a Motte and Bailey castle, now completely disappeared, but still retains a courthouse built in the reign of Queen Elizabeth I: the first (Wapentake) court in West Derby was established around 1,000 years ago.
Split into simpler sentences: West Derby once had a Motte and Bailey castle, now completely disappeared. There still retains a courthouse built in the reign of Queen Elizabeth I: the first (Wapentake) court in West Derby was established around 1,000 years ago.