Complex sentence: Nitsch served time in jail for blasphemy before being invited to New York in 1968 by Jonas Mekas where he organised a series of performances which greatly influenced the radical New York art scene.
Split into simpler sentences: Nitsch served time in jail for blasphemy before being invited to New York in 1968 by Jonas Mekas. Nitsch organised a series of performances which influenced the radical New York art scene.