Complex sentence: It was developed by the Spetstekhnika design bureau in Ekaterinburg in the 1960s originally for the Soviet T-64A tank, and were manufactured at the artillery plant no.9 in Ekaterinburg and Motovilikha in Perm.
Split into simpler sentences: It was developed by the Spetstekhnika design bureau in Ekaterinburg in the 1960s originally for the T-64A tank. They were then manufactured at the artillery plant no.9 in Ekaterinburg and Motovilikha in Perm.