Его отец начал работать на заводе,

Его отец начал работать на заводе, когда ему было двадцать лет. До этого он жил в деревне.

Результаты (английский) 1:

His father began working at the plant when he was twenty years old. Prior to that, he lived in the village.

Результаты (английский) 2:

His father started working at the factory when he was twenty years old. Before that, he lived in the village.

Результаты (английский) 3:

his father began to work at the factory when he was twenty years old. prior to that, he lived in the village.