Complex sentence: Since Lappland is located above the arctic circle, the polar night has begun, meaning that there is one month until dawn, with only a few hours of twilight each day before complete darkness, much to Saga's dismay.
Split into simpler sentences: Since Lappland is located above the arctic circle, the polar night has begun. With one month until dawn, there are only a few hours of twilight each day before complete darkness, much to Saga's dismay.