Complex sentence: Blanco bore her youngest son, Michael Corleone Blanco by her lover Darío Sepúlveda; he left her in 1983, returning to Colombia, kidnapping Michael when he and Griselda disagreed over who would take custody.
Split into simpler sentences: Blanco bore her youngest son, Michael Corleone Blanco, by her lover Darío Sepúlveda. Sepúlveda left her in 1983, returned to Colombia, and kidnapped Michael when he and Blanco disagreed over who would take custody.