Complex sentence: By the 1980s, postmodern architecture appeared to trend over modernism; however, postmodern aesthetics lacked traction and by the mid- 1990s, a new surge of modern architecture once again established international pre-eminence.
Split into simpler sentences: By the 1980s, postmodern architecture appeared to trend over modernism. High postmodern aesthetics lacked traction and by the mid- 1990s, a new surge of modern architecture once again established international pre-eminence.