Complex sentence: The stable continued adding members, most notably Canadian Kenny Omega, who took over its leadership in early 2016, when Styles, Anderson, and Gallows all left NJPW for WWE--with this trio appearing in WWE as The Club in reference to the group.
Split into simpler sentences: The stable continued adding members, most notably Canadian Kenny Omega, who took over its leadership in early 2016. When Styles, Anderson, and Gallows all left NJPW for WWE, this trio appearing in WWE as The Club in reference to the group.