Complex sentence: The First Hen Egg or Jeweled Hen Egg is a Tsar Imperial Fabergé egg, the first in a series of fifty-four jeweled eggs made under the supervision of Peter Carl Fabergé for the Russian Imperial family.
Split into simpler sentences: The First Hen Egg or Jeweled Hen Egg is a Tsar Imperial Fabergé egg. It became the first in a series of more than 50 such jeweled eggs made under the supervision of Peter Carl Fabergé for the Russian Imperial family.