Complex sentence: Even without the climate issue, several large college football stadiums also host bowl games around New Year's Day; the league needs at least one week to build the ice and several days to melt and disassemble the rink.
Split into simpler sentences: Even without the climate issue, several large college football stadiums also host bowl games around New Year's Day. The league needs at least one week to build the ice and several days to melt and disassemble the rink.