Complex sentence: The initial founders of Procés Constituent were economist and activist, Arcadi Oliveres and doctor and nun, Teresa Forcades, who launched the initiative by publishing a "Manifesto: call for a constituent process in Catalonia".
Split into simpler sentences: The initial founders of Procés Constituent were economist and activist, Arcadi Oliveres and doctor and nun, Teresa Forcades. They published a "Manifesto: call for a constituent process in Catalonia".