Complex sentence: Speaker's Corner has been established as a point of free speech and debate since 1872, while the Chartists, the Reform League, the suffragettes, and the Stop the War Coalition have all held protests there.
Split into simpler sentences: Speaker's Corner has been established as a point of free speech and debate since 1872. The Chartists, the Reform League, the suffragettes, and the Stop the War Coalition have all held protests there.