Complex sentence: For example, cycling mammalian and yeast cells double the amount of NPC in the nucleus between the G1 and G2 phase of the cell cycle, and oocytes accumulate large numbers of NPCs to prepare for the rapid mitosis that exists in the early stages of development.
Split into simpler sentences: For example, cycling mammalian and yeast cells double the amount of NPC in the nucleus between the G1 and G2 phase of the cell cycle. And oocytes accumulate large numbers of NPCs to prepare for the rapid mitosis that exists in the early stages of development.