A Beginner trying to crochet a Mile-A-Hour Afghan Pattern: Question about reading pattern

My Mile-An-Hour Afghan pattern is worked in strips or panels. The part I am not reading correctly or understanding is in bold face type.It is as follows. Row 2: Skip first 3-dc shell; work 3 dc, ch 3 and 3 dc in next ch 3 sp between shells; skip next 3-dc shell; dc in sp between last dc of shell and next ch-3 turning ch. Ch 3, turn.For some reason, I am not understanding this. I am sure that experienced crochet people know exactly what it says to do.Would really appreciate help in the way of explanation or even better, a drawing of this part of the pattern.Thanks very much.Carolyn