original: Interethnic tensions resulted in a horrible massacre, in which most Armenians in the town of Shusha perished.
simplifications: Ethnic tensions caused a horrible massacre.  During this massacre most Armenians in the town of Shusha died. Many Armenians perished in the town of Shusha because of tensions and conflicts. Interethnic tensions resulted in a massacre. Most Armenians in the town of Shusha perished. Interethnic tensions resulted in a horrible massacre. At that time, most Armenians in the town of Shusha died. Most Armenian people in Shusha died in a terrible massacre, which was caused by Interethnic tensions. Tensions between different peoples led to a horrible massacre. Most Armenians in Shusha perished. Ethnic tensions resulted in a terrible massacre, which most Armenians in the town of Shusha perished. Tensions between different ethnic groups resulted in many killings. Most of the Armenians in Shusha died. Tensions relating to ethnicity resulted in a massacre. In this massacre most Armenians living in Shusha perished. Interethnic conflicts led in a horrible massacre that killed most of the Armenians in Shusha City.