Complex sentence: Succeeded as COMARRC by Sir Mike Jackson, Walker was promoted to acting general and appointed Commander in Chief, Land Command on 27 January 1997 and granted the substantive rank of general on 2 April 1997.
Split into simpler sentences: Succeeded as COMARRC by Sir Mike Jackson, Walker was promoted to acting general and appointed Commander in Chief, Land Command on 27 January 1997. He was granted the substantive rank of general on 2 April 1997.