Complex sentence: Following a controversial defamation case in 2006 between fellow SSP MSP Tommy Sheridan and the British tabloid newspaper "The News Of The World", Sheridan and Byrne split from the SSP, and formed a new socialist party which they named "Solidarity".
Split into simpler sentences: Following a controversial defamation case in 2006 between fellow SSP MSP Tommy Sheridan and the British tabloid newspaper "The News Of The World" both Sheridan and Byrne split from the SSP. They then formed a new socialist party which they named "Solidarity".