Complex sentence: Gleitzman has also published three collections of his newspaper column writing from The Age and The Sydney Morning Herald into books for adult readers and is additionally a former writer for the popular Norman Gunston Show in the 1970s.
Split into simpler sentences: Gleitzman has also published three collections of his newspaper columns for The Age and The Sydney Morning Herald into books for an adult readership. He used to write for the popular Norman Gunston Show in the 1970s.