Complex sentence: The association between Morshead and the 9th Division was not entirely broken however, as it formed part of his corps, along with the 6th and 7th Divisions, all three of which were undergoing jungle training on the Atherton Tableland for upcoming battles in New Guinea.
Split into simpler sentences: The association between Morshead and the 9th Division was not entirely broken however, as it formed part of his corps, along with the 6th and 7th Divisions. All three were undergoing jungle training on the Atherton Tableland for upcoming battles in New Guinea.