Complex sentence: This is not a problem for factory work and gives less spring for dancing but is a disadvantage when hill walking as the wearer tends to cantilever off the tip of the toe which gets worn quickly.
Split into simpler sentences: This is not a problem for factory work but is a disadvantage for dancing and hill walking. In the former case there is less spring and in the latter case the wearer tends to cantilever off the tip of the toe which gets worn quickly.