Complex sentence: In 1989 Peter Swenson posited the existence of a contingent "wage policy trilemma" encountered by trade unions trying to achieve three egalitarian goals simultaneously: compressing wages within a bargaining sector, compressing wages between sectors, and maximizing access to employment in the sector.
Split into simpler sentences: In 1989 Peter Swenson posited the existence of "wage policy trilemmas" encountered by trade unions trying to achieve three egalitarian goals simultaneously. One involved attempts to compress wages within a bargaining sector while compressing wages between sectors and maximizing access to employment in the sector.