Complex sentence: The oblast forms the westernmost part of Russia; it has no land connection to the rest of the country being surrounded by Poland to the south, Lithuania to the east and north, and the Baltic Sea to the west.
Split into simpler sentences: The oblast forms the westernmost part of Russia; it has no land connection to the rest of the country. It is surrounded by Poland to the south, Lithuania to the east and north, and the Baltic Sea to the west.