Grid layout new row

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Is there a way to add a new row to a bootstrap 3 gridlayout?
I can only see a way to add blocks to the column within a row, rather than add a new row with more columns.
In the attached image, each cell of the grid has e.g "cell 1", "cell 2" in it. If 3 and 4 were on a new row, as desired, they would be at the same vertical position.
The only way I can see to achieve this behaviour is to add a new layout entirely, which is cumbersome and not usable in my project.

In other words, I want the html to look something like:
<div class="container">
   <div class="row">
      <div class="col-sm-12">
         <div class="row">
            <div class="col-sm-6">
               <p>cell 1</p>
               <p>cell 1</p>
               <p>cell 1</p>
            </div>
            <div class="col-sm-6">
               <p>cell 2</p>
            </div>
         </div>
         <div class="row">
            <div class="col-sm-6">


instead of:
<div class="container">
   <div class="row">
      <div class="col-sm-12">
         <div class="row">
            <div class="col-sm-6">
               <p>cell 1</p>
               <p>cell 1</p>
               <p>cell 1</p>
               <p>cell 3</p>
            </div>
            <div class="col-sm-6">
               <p>cell 2</p>
               <p>cell 4</p>
            </div>
         </div>

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