Complex sentence: Aparajita was an eighth century "Digambara monk" whose defence of ascetic nakedness gave the standard "Digambara" view which relegated "Śvētāmbara" monks and nuns to the status of lay people.
Split into simpler sentences: Aparajita was an eighth century "Digambara monk" who defended the practice of "Digambara monks" of being nude. His explaination reduced "Śvētāmbara" monks and nuns to the status of lay people.