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<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_place_after">
        <observer name="sales_order_grid_vendors" instance="CompanyVendorsObserverAdminhtmlVendorAddVendorSalesOrders" />
    </event>
</config>

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_place_after">
        <observer name="sales_order_grid_vendors_customer" instance="CompanyVendorsObserverAddVendorOrders" />
    </event>
</config>

namespace CompanyVendorsObserverAdminhtmlVendor;
use MagentoFrameworkEventObserver;
use MagentoFrameworkEventObserverInterface;
class AddVendorSalesOrders implements ObserverInterface
{
  public function execute(Observer $observer)
      {
        die('mujassam');
      }
}

namespace CompanyVendorsObserver;
use MagentoFrameworkEventObserver;
use MagentoFrameworkEventObserverInterface;
class AddVendorOrders implements ObserverInterface
{
  public function execute(Observer $observer)
      {
        die('mujassam');
      }
}

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_place_after">
        <observer name="sales_order_grid_vendors_customer" instance="CompanyVendorsObserverAddVendorOrders" />
    </event>
</config>

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <block class="MagentoCatalogBlockProductListProduct" name="YourName" cacheable="false"/>
    </body>
</page>