I wanted long sleeves, so I modified the pattern as follows for each sleeve after the last purl row:

Knit 1 row onto circular needle, place stitch marker for sleeve “seam” and continue in the round (on my sweater this was 44 stitches before decrease rows began):

Decrease rounds:
Row 1: K1, k2tog, knit to last 3 stitches, sl 1, k1, psso; k1.
Rows 2-10: Knit

Repeat decrease rows 8 times in total - 16 stitches decreased (28 stitches remaining on my sweater).

Change to 3.75 mm DP needles.

Work k2, p2 ribbing for 10 rounds; cast off in ribbing.