<form method="post">
    <div class="group">
        <label>Label1</label>
        <input name="title" type="text" value="Something">
    <span class="infotext">Lorem ipsum bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla</span>
    </div>
    <div class="group">
      <label>Label2</label>
        <input name="title" type="text" value="Something2">
    <span class="infotext">Some infotext</span>
    </div>
</form>

label {
  float: left;
  display: block;
}
.group {
  display: block;
  margin-bottom: 10px;
}

.infotext {
  display: inline-block;
}