Complex sentence: This was never completed due to the economic conditions at the time, however the foundation and caissons for this yet-to-be-built high-rise can be seen covered artfully by aluminum sheathing.
Split into simpler sentences: This was never completed due to the economic conditions at the time. However, the foundation and caissons for this yet-to-be-built high-rise can be seen covered artfully by aluminum sheathing.