Decomposing the Full Address

Greetings,

Right now I have a Frontend form where the user can enter their complete address in a field named “address”.
All these addresses are saved through this function:

****************************************************

function gmw_update_location_via_wpuf(  $post_id ) {

	//make sure we have post ID
	if ( !$post_id )
		return;

    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return;
    }

	//change meta_field_name to the custom field of the address field _wppl_street
	$address = get_post_meta( $post_id, 'address', true );
	$_wppl_street = get_post_meta( $post_id, '_wppl_street', true );
	$phone = get_post_meta( $post_id, 'phone', true );
	$fax = get_post_meta( $post_id, 'fax', true );
	$email = get_post_meta( $post_id, 'email', true );
	$website = get_post_meta( $post_id, 'website', true );

    if ( empty( $address ) )
	return;

	//include geocoder file
	include_once( GMW_PT_PATH .'/includes/gmw-pt-update-location.php' );

	if ( function_exists( 'gmw_pt_update_location' ) ) {
		//setup geocoder args
		$args = array(
			'post_id'         => $post_id,
			'post_title'      => get_the_title( $post_id ),
			'address'         => $address,
			'_wppl_street'    => $_wppl_street,
			'additional_info' => array(
				'phone'   => $phone,
				'fax'     => $fax,
				'email'   => $email,
				'website' => $website
			)
		);
		//run geocoder function
		gmw_pt_update_location( $args );
	}
}
//update data of new post
add_action('wpuf_add_post_after_insert', 'gmw_update_location_via_wpuf', 10, 1 );
//update data when post updated
add_action('wpuf_edit_post_after_update', 'gmw_update_location_via_wpuf', 10, 1 );

**************************************************** 

Now, I would prefer if the user enters his address but through multiple fields instead, like this:
street
apt
city
state
zipcode
country

My Question is:
How could I modify the above code to use these fields instead of a single address field?

Thanks in advance for your kind help,