Complex sentence: Overnight Farre managed to escape, and it was discovered that Gascoigne was an Italian citizen and so was spared the firing squad; however, Lucas and Lisle were executed in the evening of 28 August.
Split into simpler sentences: Overnight Farre managed to escape, and it was discovered that Gascoigne was an Italian citizen, so he was spared the firing squad. However, Lucas and Lisle were executed in the evening of 28 August.