Complex sentence: From 1815, Gumbinnen was the capital of Regierungsbezirk Gumbinnen, an administrative district of the Province of East Prussia, and became part of the German Empire upon the unification of Germany in 1871.
Split into simpler sentences: From 1815, the town was the capital of Regierungsbezirk Gumbinnen administrative district in the Province of East Prussia. Gumbinnen became part of the German Empire upon the unification of Germany in 1871.