Complex sentence: During the ensuing decades Shackleton's status as a polar hero was generally outshone by that of Captain Scott, whose polar party had by 1925 been commemorated on more than 30 monuments in Britain alone, including stained glass windows, statues, busts and memorial tablets.
Split into simpler sentences: During the ensuing decades Shackleton's status as a polar hero was generally outshone by that of Captain Scott. Scott's polar party had by 1925 been commemorated in Britain alone by more than 30 monuments, including stained glass windows, statues, busts and memorial tablets.