Complex sentence: After the death of his first wife, Kotzebue retired from the Russian service, and lived for a time in Paris and Mainz; in 1795, he settled on an estate which he had acquired near Reval and devoted himself to writing.
Split into simpler sentences: After the death of his first wife, Kotzebue retired from the Russian service and lived for a time in Paris and Mainz. In 1795 he settled on an estate which he had acquired near Reval and devoted himself to writing.