Please help with abbreviations

I am new to the knitting world and have just mastered the pearl and knitt stitch but on my 3rd row I am to P1,(K1,P1,K1) in front of the next stitch,P3tog; rep from to last stitch,P1.

Im a little confused .If someone could explain this in simpler terms it would be very much appreciated.

It is a double increase. You do just what the instructions say.

Knit 1, do not slide the old stitch off the needle, bring your yarn forward and purl into the same stitch you just knit. Do not slide the stitch off the needle; bring your yarn back and knit the stitch again.

thank you il give it a go now!