Complex sentence: There was speculation that an Independent candidate, Henry Liversidge, who might be best described as a Lib-Lab and who had earlier in 1905 announced an intention to contest the next election, stand as a candidate on the platform of tariff reform.
Split into simpler sentences: There was speculation that an Independent candidate, Henry Liversidge, would also stand. Earlier in 1905 he announced an intention to contest the next election as a Lib-Lab candidate, but on the platform of tariff reform.