wèi / le / bǎo / zhù / zì / jǐ / de / dì / wèi / tā / jìng / rán / rèn / zéi / zuò / fù / bèi / pàn / le / xī / rì / de / péng / you

为了保住自己的地位，他竟然认贼作父，背叛了昔日的朋友。

To preserve his position, he actually betrayed his former friends by siding with the enemy.