Complex sentence: Metsähallitus has been practicing the slash-and-burn agriculture at Telkkämäki since 1993.Turnip and rye are the typical crops grown at Telkkämäki farm.
Split into simpler sentences: Metsähallitus has been practising the slash-and-burn agriculture at Telkkämäki since 1993. The turnip and rye are the typical crops which they grow at Telkkämäki farm.