Complex sentence: Armavir was regarded as an old capital of Armenia, said to have been founded by King Armais in 1980 B.C. King Argishti I of Urartu built a fortress in the area and named it Argishtikhinili.
Split into simpler sentences: Armavir was regarded as an old capital of Armenia, said to have been founded by King Armais in 1980 BCE. King Argishtis I of Urartu built a fortress in the area and named it Argishtikhinili.