Complex sentence: Of these works, the life of Thomas Becket has been lost, but the others survive in manuscript, but only one has been published-the "Defloratio Historiae naturalis Plinii" in the early 20th century.
Split into simpler sentences: Of these works, the life of Thomas Becket has been lost. The others survive in manuscript, though only one has been published-the "Defloratio Historiae naturalis Plinii" in the early 20th century.