Complex sentence: Swimsuits are also worn when there is a need to display the wearer's physical attractiveness, as in the case of beauty pageants or bodybuilding contests, and glamour photography and magazines like the annual "Sports Illustrated Swimsuit Issue" feature models and sports personalities in swimsuits.
Split into simpler sentences: Swimsuits are also worn when there is a need to display the body, as in the case of beauty pageants or bodybuilding contests. Swimsuits accentuate the wearer's physical attractiveness, so that glamour photography and magazines like the annual "Sports Illustrated Swimsuit Issue" feature models and sports personalities in swimsuits.