Simplify the following text for a Grade 4 native English-speaking person.
Original: Some versions say Artemis helped her mother give birth to Apollo for nine days . Another variation states that Artemis was born one day before Apollo , on the island of Ortygia and that she helped Leto cross the sea to Delos the next day to give birth to Apollo .
Simplified: Artemis was born first , who then helped Leto to give birth to Apollo .