YearRange.php

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<?php
namespace Magento\Catalog\Block\Adminhtml\Form\Renderer\Config;

use Magento\Config\Block\System\Config\Form\Field;
use Magento\Framework\Data\Form\Element\AbstractElement;

class YearRange extends Field
{
    protected function _getElementHtml(AbstractElement $element)
    {
        $element->setStyle('width:70px;')->setName($element->getName() . '[]');

        if ($element->getValue()) {
            $values = explode(',', $element->getValue());
        } else {
            $values = [];
        }

        $from = $element->setValue(isset($values[0]) ? $values[0] : null)->getElementHtml();
        $to = $element->setValue(isset($values[1]) ? $values[1] : null)->getElementHtml();
        return '<label class="label"><span>' . __('from') . '</span></label>'
        . $from .
        '<label class="label"><span>' . __('to') . '</span></label>'
        . $to;
    }
}