split order after checkout depending on products vendors

I need to split order before thank you page view depending on products vendors
for example If the order contains 5 products from different vendors
– 2 products from X vendor
– 2 products from Z vendor
– 1 product from S vendor
so I need to generate 3 different orders from the original order data and store the generated orders instead of the original order
I’m using WCFM marketplace plugin, and I found a premium plugin that doing this but for another multi-vendor plugin

Here is what I done in code, but I get Internal Server Error

    add_action( 'woocommerce_checkout_create_order', 'HF_before_checkout_create_order', 20, 2 ); 
    function HF_before_checkout_create_order( $order, $data ){
      global $wpdb;
      global $WCFM;
      global $woocommerce;

      $vendors = array();

      foreach( $order->get_items() as $key => $item ) {
        $product_id = $item['product_id'];
        $vendor = $WCFM->wcfm_vendor_support->wcfm_get_vendor_id_from_product( $product_id );
        if( $vendor ) {
          $vendors[] = $vendor;
          // wc_delete_order_item( $key );
        }

        if( count($vendors) ) :

          foreach( $vendors as $vendor_order ) :

              $order_seller = new WC_Order();

              foreach( $data['line_items'] as $line_item ) {
                  $args = $line_item['args'];
                  $product = wc_get_product( isset($args['variation_id']) && $args['variation_id'] > 0 ? $$args['variation_id'] : $args['product_id'] );
                  $product_vendor = $WCFM->wcfm_vendor_support->wcfm_get_vendor_id_from_product( $product->ID );
                  if( $product_vendor == $vendor_order ) :
                    $order_seller->add_product( $product, $line_item['quantity'], $line_item['args'] );
                  endif;
              }

            $order_seller->set_address( $order->get_address( 'billing' ), 'billing' );
            $order_seller->set_address( $order->get_address( 'shipping' ), 'shipping' );

            $order_seller->calculate_taxes();
            $order_seller->calculate_totals();
            $order_seller->save();

          endforeach;

        endif;
      }

      $order->update_status(
        'cancelled',
        __( 'This order has been splitted to separate orders' )
      );
      $history = $order->addStatusHistoryComment('Order marked as cancelled.', false);
      $history->setIsCustomerNotified(false);
      $order->save();
           
    }