What is "indo-sasanians"

The Indo-Sassanids, Kushano-Sassanids or Kushanshas (also Indo-Sassanians) were a branch of the Sassanid Persians who established their rule in the northwestern South Asia during the third and fourth centuries at the expense of the declining Kushans. They were in turn displaced in 410 by the invasions of the Huna people. They were able to re-establish some authority after the Sassanids destroyed the Hephthalites in 565, but their rule collapsed under Arab attacks in the mid 7th century.