1. The act of making something overly simple, reducing complexity in a way that loses important details or nuance
The article's oversimplification of the economic crisis missed crucial factors.
A simplificação excessiva do artigo sobre a crise econômica perdeu fatores cruciais.
2. A statement or explanation that is too simple and therefore inaccurate or misleading
Saying all politicians are corrupt is a gross oversimplification.
Dizer que todos os políticos são corruptos é uma simplificação excessiva grave.