Complex sentence: Potong Pasir is currently managed by Singapore's longest serving opposition Member of Parliament (MP), Chiam See Tong, from the Singapore People's Party, which is part of the Singapore Democratic Alliance, which is made up of four opposition parties.
Split into simpler sentences: Potong Pasir is currently managed by Singapore's longest serving opposition Member of Parliament (MP), Chiam See Tong. The Singapore People's Party, of which he is a member, is part of the Singapore Democratic Alliance, which is in turn made up of four opposition parties.