2 sentences

1. 他是个典型的两面派，在人前一套，人后一套。

   tā shì gè diǎn​xíng de liǎng​miàn​pài, zài rén​qián yī tào, rén​hòu yī tào.

   He is a typical double-dealer, saying one thing to people's faces and another behind their backs.

   Source: Dong Chinese Dictionary

2. 这种两面派的作风在组织中是绝对不允许的。

   zhè zhǒng liǎng​miàn​pài de zuò​fēng zài zǔ​zhī zhōng shì jué​duì bù yǔn​xǔ de.

   This kind of two-faced behavior is absolutely not allowed within the organization.

   Source: Dong Chinese Dictionary