Simplify the following text for a Grade 7 native English-speaking person.
Original: The parish church , unused since the 1970s , is on the site of an early Christian monastery founded by St AdomnÃ n , Abbot of Iona ( died 704 ) .
Simplified: The parish church , unused since the 1970s , is on the site of an early Christian monastery founded by St. AdomnÃ n , Abbot of Iona .