Original sentence: At the time, IBM didn't believe in the potential of Codd's ideas, leaving the implementation to a group of programmers not under Codd's supervision.This led to an inexact interpretation of Codd's relational model, that matched only part of the prescriptions of the theory; the result was Structured English QUEry Language or SEQUEL
Edited sentence: At the time, IBM didn't believe in the potential of Codd's ideas, leaving the implementation to a group of programmers not under Codd's supervision, who violated several fundamentals of Codd's relational model; the result was Structured English QUEry Language or SEQUEL