Complex sentence: Aden (",") is a seaport city in Yemen, located by the eastern approach to the Red Sea (the Gulf of Aden), some 170 kilometres east of Bab-el-Mandeb.
Split into simpler sentences: Aden (",") is a city in Yemen. It is a seaport, located by the eastern approach to the Red Sea (the Gulf of Aden), some 170 kilometres east of Bab-el-Mandeb.