Complex sentence: That night the prisoners were awakened and driven in carts on a road leading to the village of Siniachikha, some 18 kilometres from Alapaevsk where there was an abandoned iron mine with a pit, twenty metres deep.
Split into simpler sentences: That night the prisoners were awakened and driven in carts on a road leading to the village of Siniachikha. Some 18 kilometres from Alapaevsk where there was an abandoned iron mine with a pit, twenty metres deep.