Move Description Location

To move the description to under the product image, try this in functions.php for your child theme:

  add_action( 'woocommerce_before_single_product_summary', 'custom_show_description', 60 );
  function custom_show_description() {
    global $post;
    echo '<h3>Description</h3>'.PHP_EOL;
    echo the_content();
  } // end function

  add_filter( 'woocommerce_product_tabs', 'remove_description_tab', 60 );
  function remove_description_tab($tabs) {
    if ( isset( $tabs['description'] ) ) {
      unset( $tabs['description'] );
    } 
    return $tabs;
  }

Works for Storefront. Behaviour with other themes may differ.

That’s what it did on Storefront. Please could you put it back a moment so I can try to debug it.

My test theme has an extra div which makes it possible, but we can add the extra div to your theme in the same way:

  add_action( 'woocommerce_before_single_product_summary', 'custom_open_div', 5 );
  function custom_open_div() {
    echo '<div class="product_page_left_side">'.PHP_EOL;
  }

  add_action( 'woocommerce_before_single_product_summary', 'custom_show_description', 60 );
  function custom_show_description() {
    global $post;
    echo '<h3>Description</h3>'.PHP_EOL;
    echo the_content();
  } // end function

  add_action( 'woocommerce_before_single_product_summary', 'custom_close_div', 80 );
  function custom_close_div() {
    echo '</div>'.PHP_EOL;
  }

  add_filter( 'woocommerce_product_tabs', 'remove_description_tab', 60 );
  function remove_description_tab($tabs) {
    if ( isset( $tabs['description'] ) ) {
      unset( $tabs['description'] );
    } 
    return $tabs;
  }

Again, please leave it in if it doesn’t work.

Sorry, I don’t know what that could be.

The snippet validates here:
http://phpcodechecker.com/

Please validate the whole contents of your functions.php.

Unfortunately I can’t test it with your theme as I don’t have access to it.

Its getting nearer. Try this custom css:

.single-product .product_page_left_side {
  width: 48%;
  float:left
}
.woocommerce #content div.product div.images,
.woocommerce div.product div.images,
.woocommerce-page #content div.product div.images,
.woocommerce-page div.product div.images {
  width: 100%;
}