2 sentences

1. 他平时独来独往，很少和同事聚会。

   tā píng​shí dú​lái​dú​wǎng, hěn shǎo hé tóng​shì jù​huì.

   He is usually a loner and rarely socializes with his colleagues.

   Source: Dong Chinese Dictionary

2. 他总是独来独往，在同事眼中是个怪物。

   tā zǒng​shì dú​lái​dú​wǎng, zài tóng​shì yǎn​zhōng shì gè guài​wu.

   He is always a loner and is seen as a freak by his colleagues.

   Source: Dong Chinese Dictionary