Complex sentence: Smarsh acquired Presensoft, a cloud-based instant message archiving company, in 2015, and in December 2016, it acquired MobileGuard, a mobile communication monitoring and retention solutions provider.
Split into simpler sentences: Smarsh acquired Presensoft, a cloud-based instant message archiving company, in 2015. In December 2016, Smarsh acquired MobileGuard, a mobile communication monitoring and retention solutions provider.