Complex sentence: Rybin Georgy Nikolaevich (18.04.1901, Zharkent 01.03.1974, Leningrad) was a Russian hуdrographer, explorer of the Arctic seas and the Baltic Sea.
Split into simpler sentences: Rybin Georgy Nikolaevich (18.04.1901, Zharkent 01.03.1974, Leningrad)-Russian hуdrographer. Explorer of the Arctic seas and the Baltic Sea.