3 sentences

1. 他独自一人度过了这个漫漫长夜。

   tā dú​zì yī rén dù​guò le zhè gè màn​màn cháng​yè.

   He spent this long night all alone.

   Source: Dong Chinese Dictionary

2. 在这漫漫长夜里，他一直在思考未来的方向。

   zài zhè màn​màn cháng​yè lǐ, tā yī​zhí zài sī​kǎo wèi​lái de fāng​xiàng.

   During this long, long night, he kept thinking about his future direction.

   Source: Dong Chinese Dictionary

3. 漫漫黄沙在大风中起伏，景象十分壮观。

   màn​màn huáng​shā zài dà​fēng zhōng qǐ​fú, jǐng​xiàng shí​fēn zhuàng​guān.

   The vast stretches of yellow sand surged in the gale, a truly magnificent sight.

   Source: Dong Chinese Dictionary