Complex sentence: However, Aztec 1Xochital is 13 days earlier on Mayan day 1Manik and Aztec day 1Acatl is on Mayan day 1Ahau.
Split into simpler sentences: However, Aztec day 1Xochital is 13 days earlier on Mayan day 1Manik. And Aztec day 1Acatl is on Mayan day 1Ahau.