<div class="cp_h1title"><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. </span><h1>見出しテキスト</h1><data>0123</data></div>

.cp_h1title {
  border: 1px solid #000000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: center;
}
.cp_h1title span {
  font-size: 10px;
  line-height: 1.1;
  display: block;
  width: 20%;
  padding: 5px;
  text-align: left;
}
.cp_h1title h1 {
  position: relative;
  width: calc(100% - 25%);
  margin: 0;
  padding: 0 15px;
}
.cp_h1title h1::before,
.cp_h1title h1::after {
  position: absolute;
  content: '';
  background: #000000;
  top: 0;
  width: 40px;
  height: 100%;
  clip-path: polygon(0% 0%, 0% 100%, 20% 100%, 5% 80%, 1% 50%, 5% 20%, 20% 0);
}
.cp_h1title h1::before {
  left: 0;
}
.cp_h1title h1::after {
  right: 0;
  transform: rotate(180deg);
}
.cp_h1title data {
  width: 5%;
  font-size: 10px;
  padding: 0 5px;
}