Complex sentence: She can visit 75 flowers per trip and it takes about 25 trips to create a complete pollen/nectar provision mass. She will work tirelessly during the day, only stopping once the sun has gone down.
Split into simpler sentences: She can visit 75 flowers per trip, and it takes 25 trips to create a complete pollen/nectar provision. She works tirelessly during the day, only stopping once the sun has gone down.