Complex sentence: Ells and his father calculated that the store would need to sell 107 burritos per day to be profitable; however, after one month, the original restaurant was selling over 1,000 burritos a day.
Split into simpler sentences: Ells and his father calculated that the store would need to sell 107 burritos per day to be profitable. After one month, the original restaurant was selling over 1,000 burritos a day.