In this paragraph, Friar Lawrence is telling Juliet how she can evade her marriage with Paris and live happily with Romeo in Mantua.  She must drink this strange liquid in a vial that will make her appear dead when she is actually just sleeping.  Her nurse will try to wake her up until she realizes that Juliet is "dead".  Juliet's funeral will take place the same day and her body will be placed near Tybalt's.  Then, the Friar will notify Romeo about the situation and how he will need to go get her in the tomb of the Capulets and take her to Mantua with him.