Complex sentence: Some of the commandos mustered five troops until the end of 1976; with the university students demobbing at the end of 1976, the commandos reverted back to four troops (in 2 Commando's case 9 Troop was deactivated).
Split into simpler sentences: Some of the commandos mustered five troops until the end of 1976. With the university students demobbing at the end of 1976, the commandos reverted back to four troops (in 2 Commando's case 9 Troop was deactivated).