Complex sentence: Anglicans in provinces which continue to use the 1662 Book of Common Prayer as the primary authority also retain Sexagesima Sunday along with the two other pre-Lenten Sundays, as do those who use the 1928 American Book of Common Prayer.
Split into simpler sentences: Anglicans in provinces which continue to use the 1662 Book of Common Prayer as the primary authority also retain Sexagesima Sunday along with the two other pre-Lenten Sundays. Likewise for those who use the 1928 American Book of Common Prayer.