Complex sentence: Bengal was connected with the Aryan culture until the mid- 8th century, during which period Harsavardhan of Northern India, Bhaskaravarman of Kamarupa, Yashovarman of Kanyakubja and Lalitaditya of Kashmir exerted influence.
Split into simpler sentences: Bengal was connected with the Aryan culture until the mid- 8th century. During this period Harsavardhan of Northern India, Bhaskaravarman of Kamarupa, Yashovarman of Kanyakubja and Lalitaditya of Kashmir exerted influence.