Complex sentence: Crerar attempted to introduce certain attributes of a standard party to the Progressives including Parliamentary Whips and a national party organization, these efforts were resisted, however, and in 1922 Crerar resigned as leader.
Split into simpler sentences: Crerar attempted to introduce certain attributes of a standard party to the Progressives, including Parliamentary Whips and a national party organization. These efforts were resisted, however, and in 1922, Crerar resigned as leader.