Key members of the National Movement for the Liberation of the Azawad (MNLA) split from the group and created Mouvement pour le Salut de l’Azawad (MSA). The MSA is an initiative led by two former MNLA figures, Moussa Ag Acharatoumane and Assalat Ag Habi. While Moussa have been active public figure, Assalat on the other hand have kept a low profile and his last appearance was back in April 2012 at Gao airport when the MNLA and other groups seized control of the city. He was accused by pro-Malian media to be behind an attack on Malian security forces checkpoint in Ménaka February 2016, but that was never confirmed.
Ag Habi is also a close figure to Elhadj Ag Gamou and Iyad Ag Ghali, all three were close friends and were key members of 1990s Tuareg rebellion. Ag Habi defected the Malian Army in 2011 to join the MNLA and 2012 Tuareg rebellion. He was reported to have joined platform groups supportive of the Malian government in April 2015 but that was never confirmed. Ag Habi is more known for his military experience because of the years he spent in Libya. He is comfortable speaking in Arabic than in French like most former Malian military officers and commanders.
This division is another outcome during post conflict when influential members within certain community attempt to position themselves. Both Ag Acharatoumane and Ag Habi are key figures within Tuareg clans based in Ménaka region on the borders with Niger, Douassahak and Chamanamas respectively. Thus although MSA claims to represent communities throughout Azawad (northern Mali), this is unlikely to be case because of their limited influence and popularity among other communities.
I will add analysis and more context to this soon. Images below posted Moussa Ag Acharatoumane on 05 September 2016 (Source).