Complex sentence: In all 32 of the 59 Commonwealth nations due to take part boycotted the Games, the lowest turnout since 1950, to protest the Thatcher Government's attitude towards British sporting links with apartheid-era South Africa.
Split into simpler sentences: In all 32 of the 59 Commonwealth nations due to take part boycotted the Games. The boycott was over the Thatcher Government's attitude towards British sporting links with apartheid-era South Africa.