Complex sentence: While married to Kirkland, she gave birth on December 11,1944, to a son fathered by Otto Preminger; he was named Erik Lee and has been known successively as Erik Kirkland, Erik de Diego, and Erik Preminger.
Split into simpler sentences: While married to Kirkland, she gave birth on December 11,1944, to a son fathered by Otto Preminger. Her son was named Erik Lee, but has since been known successively as Erik Kirkland, Erik de Diego, and Erik Preminger.