Complex sentence: With Hermon and Wolfson, P-Orridge founded a pseudo-society, the Knights of the Pentecostal Flame, who undertook a happening on 1 June 1968 which they entitled "Beautiful Litter".
Split into simpler sentences: With Hermon and Wolfson, P-Orridge founded a group calling themselves the Knights of the Pentecostal Flame. The Knights undertook a happening on 1 June 1968 which they titled "Beautiful Litter".