Complex sentence: Nevertheless, Dukakis is considered to have done well in the first presidential debate with George Bush, but in the second debate, Dukakis had been suffering from the flu and spent quite a bit of the day in bed.
Split into simpler sentences: Nevertheless, Dukakis is considered to have done well in the first presidential debate with George Bush. In the second debate, Dukakis had been suffering from the flu and spent quite a bit of the day in bed.