Sentence:  How could the rich , for whom life was made so simple , ever understand the subterfuges , the lies , the frauds , the errors , sins and even crimes to which the poor were driven in their efforts to overcome the great advantages the rich had in the race of <WSD>life</WSD> ? 
Meaning of the word marked with <WSD> tags:  the experience of being alive; the course of human events and activities