Complex sentence: Constanţa was then a small Black Sea port with some 25,000 inhabitants, and the mixture of various cultures and ethnic groups in the town shaped Nicolae's cosmopolitan spirit from his earliest years.
Split into simpler sentences: Constanţa was then a small Black Sea port with some 25,000 inhabitants. The mix of various cultures and ethnic groups in the town shaped Nicolae's cosmopolitan spirit from his earliest years.