Он стоял довольно далеко от них и,

Он стоял довольно далеко от них и, возможно, не слышал их слов.

Результаты (английский) 1:

He stood quite far from them and may not have heard their words.

Результаты (английский) 2:

He was standing quite far away from them and may not have heard their words.

Результаты (английский) 3:

He was quite far away from them, and may have not heard their words.