Complex sentence: Egg-shaped "Precursor Orbs" function as currency, and can be traded in for Power Cells at several locations in the game, while collecting all seven "Scout Flies" in any level rewards the player with a Power Cell.
Split into simpler sentences: Egg-shaped "Precursor Orbs" function as currency and can be traded in for Power Cells at several locations in the game. Collecting all seven "Scout Flies" per level rewards the player with a Power Cell.