Complex sentence: On this congress, Isaias Afewerki replaced secretary-general Ramadan Nur, and the movement abandoned most of its formerly Marxist-Leninist ideology in favour of a more comprehensive and pragmatic nationalist concept.
Split into simpler sentences: On this congress, Isaias Afewerki replaced secretary-general Ramadan Nur. Subsequently, the movement abandoned most of its formerly Marxist-Leninist ideology in favour of a more comprehensive and pragmatic nationalist concept.