Pineapple doiliesmeasures17"x28" -dont understand round21

Work beginning Shell, [ch2, sc in next ch-3 sp, (ch3, sc in next ch-3 sp) 5times, ch 2, skip next ch-2 sp, work shell in next ch-2 sp, ch2, work shell in next ch-2sp] 5 times** ch-1 , skip next ch-1 sp, sc in next ch-1sp, ( ch sc in next ch-1 sp) 6 times, ch1, [( dc,ch 2,dc) in next ch-2 sp, ch1, skip next ch-1 sp, sc in next ch-1 sp, ( ch 3, sc in next ch-1 sp) 6 times, ch1] 7 times, ( work shell in next ch-2 sp, ch 2 ) twice, sc in next ch -3 sp, ( ch 3 , sc in next ch-3 sp) 5times, skip next ch-2 sp**, ( ch-2 work Shell in next ch-2 sp) twice, *ch 2, sc in next ch-3 sp,( ch3, sc in next ch -3 sp) 5 times, skip next ch-2 sp, ( ch2, work Shell in next ch-2 sp) twice; repeat from* 4 times more, the repeat** to ** once,ch 2, work shell in next ch-2 sp, ch2; join with slip st to first dc.
I can understand part of it but can,t fiqure out the rest. Thank you

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