Complex sentence: The 4 "moon rocks" weigh about 0.05 grams total and are entirely enveloped in a clear plastic button the size of an American quarter and mounted to a wooden board approximately a foot square on a small podium pedestal display.
Split into simpler sentences: The 4 "moon rocks" weigh about 0.05 grams in total. They are encased in a clear plastic button the size of an American quarter and mounted to a wooden board approximately a foot square on a small podium pedestal display.