Complex sentence: Itosu Yasutsune, best known as Anko Itosu, is considered the father of modern karate although the same title is sometimes given to Gichin Funakoshi, mainly because it was Funakoshi who actually made karate known throughout Japan.
Split into simpler sentences: Itosu Yasutsune, best known as Anko Itosu, is considered the father of modern karate. Although the same title is sometimes given to Gichin Funakoshi, mainly because he's the one who actually made karate known throughout Japan.