Complex sentence: Kokhav Ya'ir (literally "Ya'ir's star") was named for Avraham Stern, who went by the alias Ya'ir, the founder and leader of the Lehi group, a militant Jewish underground active during the British Mandate of Palestine.
Split into simpler sentences: Kokhav Ya'ir (literally "Ya'ir's star") was named for Avraham Stern, who went by the alias Ya'ir. He was the founder and leader of the Lehi group, a militant Jewish underground active during the British Mandate of Palestine.