Simplify the following text for a Grade 9 native English-speaking person.
Original: Ellison took inspiration from the 1970 paper written by Edgar F. Codd on relational database management systems ( RDBMS ) named `` A Relational Model of Data for Large Shared Data Banks '' .
Simplified: Ellison had read a 1970 paper written by Edgar F. Codd on relational database management systems ( RDBMS ) .