Simplify the following text for a Grade 9 native English-speaking person.
Original: The following evening , Sarah Jane agrees to adopt the Archetype and agrees with Maria to call him `` Luke '' , since that was what she wanted to name her child if she ever had one .
Simplified: Later on , Sarah Jane agrees to adopt the Archetype and they decide to call him `` Luke '' because Sarah Jane said that if she ever had a son , she would call it `` Luke '' .