2 sentences

1. 蒋先生是这位著名的数学家。

   Jiǎng xiān​sheng shì zhè wèi zhù​míng de shù​xué​jiā.

   Mr. Jiang is that famous mathematician.

   Source: Dong Chinese Dictionary

2. 蒋、宋、孔、陈是当时著名的四大家族。

   Jiǎng, Sòng, Kǒng, Chén shì dāng​shí zhù​míng de sì dà jiā​zú.

   The Chiang, Soong, Kung, and Chen families were the four prominent families at that time.

   Source: Dong Chinese Dictionary