Complex sentence: Bertrando de Mignanelli (Siena, Republic of Siena 1370--1455 or 1460) was an Italian merchant who lived in Damascus at the beginning of the 15th century and wrote the only Latin language primary source about Tamerlane's conquest of Damascus.
Split into simpler sentences: Bertrando de Mignanelli (Siena, Republic of Siena 1370--1455 or 1460) was an Italian merchant who lived in Damascus at the beginning of the 15th century. Mignanelli wrote the only Latin language primary source about Tamerlane's conquest of Damascus.