Complex sentence: Soldier piles are most suitable in conditions where well constructed walls will not result in subsidence such as overconsolidated clays, soils above the water table if they have some cohesion, and free draining soils which can be effectively de-watered, e.g. sands.
Split into simpler sentences: Soldier piles are most suitable in conditions where well constructed walls will not result in subsidence. Ideally overconsolidated clays, soils above the water table if they have some cohesion and free draining soils which can be effectively de-watered, e.g. sands.