Complex sentence: The Tokyo ISSIS branch was led by Kujirai Daisuke (codenamed Joker), a brilliant bionics specialist and engineer, who initiated the J.A.K.Q. project and recruited the various team members.
Split into simpler sentences: The Tokyo ISSIS branch was commanded by Kujirai Daisuke (codenamed Joker), a brilliant bionics specialist and engineer. It was he who initiated the J.A.K.Q. project and recruited the various team members.