tā / men / yīn / wèi / zhè / jiàn / xiǎo / shì / fǎn / mù / chéng / chóu / shí / zài / lìng / rén / wǎn / xī

他们因为这件小事反目成仇，实在令人惋惜。

They fell out over this minor matter and became bitter enemies, which is truly regrettable.