Complex sentence: It was discovered in 2009 by Terry Herbert using a metal detector and is the largest collection of Anglo-Saxon gold ever found in England, containing approximately 5kg of gold and 2.5kg of silver.
Split into simpler sentences: It was discovered in 2009 by Terry Herbert using a metal detector. It is the largest collection of Anglo-Saxon gold ever found in England and contains approximately 5kg of gold and 2.5kg of silver.