'oversimplified' originates from the prefix 'over-' meaning 'excessively' and the verb 'simplify', which comes from Latin 'simplificare', where 'simplex' meant 'simple' and 'facere' meant 'to make'.

'simplificare' transformed into the Old French word 'simplifier', and eventually became the modern English word 'simplify'.

Initially, it meant 'to make simple', but over time it evolved into its current meaning of 'to make excessively simple'.