Clay

<div class="container">
      <div class="block-1"></div>
      <div class="block-2">
         <div class="block-link">
            <div class="block-item"></div>
            <div class="block-item"></div>
         </div>
         <div class="block-red"></div>
      </div>
   </div>

.container {
   display: flex;
}

.block-link {
   display: flex;
}

.block-red {
   width: 100%;
}