When it says x number of times you do what it says in parenthesis. So in this case -
P2, [KB1] 3 times,=
P2, KB1, KB1, KB1
This next part you repeat everything between the asterisks across to the last two stitches while continuing to to do the KB1 3 times for the second one in the group...
*p3, KB1, p3 [KB1] 3 times; rep from * to last 2 sts, p2.=
p3, KB1,, p3, KB1, KB1, KB1, p3, KB1, p3, KB1, KB1, KB1....etc to last two stitches then p2.
What are you making??