3 sentences

1. 他单身一人来到上海闯荡。

   tā dān​shēn yī rén lái​dào Shàng​hǎi chuǎng​dàng.

   He came to Shanghai alone to make his way in the world.

   Source: Dong Chinese Dictionary

2. 他不安分于现状，决定辞职去外面闯荡。

   tā bù ān​fèn yú xiàn​zhuàng, jué​dìng cí​zhí qù wài​miàn chuǎng​dàng.

   Not content with the status quo, he decided to quit his job and seek his fortune elsewhere.

   Source: Dong Chinese Dictionary

3. 他在外面闯荡多年，如今终于衣锦还乡了。

   tā zài wài​miàn chuǎng​dàng duō nián, rú​jīn zhōng​yú yì jǐn huán​xiāng le.

   After many years of making his way in the world, he has finally returned to his hometown in glory.

   Source: Dong Chinese Dictionary