1. A conclusion or termination that is uncomplicated, straightforward, or without complications
The movie had a simple ending where the hero got the girl.
O filme tinha um final simples em que o herói conseguiu a rapariga.
2. In grammar or linguistics, an ending of a word that is not compound or complex
The verb 'walk' has a simple ending '-ed' for the past tense.
O verbo 'caminhar' tem um final simples '-ou' para o tempo passado.