Complex sentence: Among many in the British Parliament who supported him was Fenner Brockway, a British Labour Party Member of Parliament (MP), and many intellectuals, particularly from the London School of Economics (LSE), who were sympathetic and supportive.
Split into simpler sentences: Among many in the British Parliament who supported him was Fenner Brockway, a British Labour Party Member of Parliament (MP). He also received support from many intellectuals, particularly from the London School of Economics (LSE), who were sympathetic and supportive.