Complex sentence: In the 1970s he became increasingly critical of the Communist regime, and was arrested in 1978 after publishing "The Alternative in Eastern Europe" (German: "Die Alternative. Zur Kritik des real existierenden Sozialismus") in Western Germany in 1977.
Split into simpler sentences: In the 1970s he became increasingly critical of the Communist regime. He was arrested after his book "The Alternative in Eastern Europe" (German: "Die Alternative. Zur Kritik des real existierenden Sozialismus") was published in West Germany in 1977.