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add_action( 'init', 'init_sensei_hooks' );
function init_sensei_hooks() {

    global $woothemes_sensei;
    remove_action( 'sensei_before_main_content', array( $woothemes_sensei->frontend, 'sensei_output_content_wrapper' ), 10 );
    remove_action( 'sensei_after_main_content', array( $woothemes_sensei->frontend, 'sensei_output_content_wrapper_end' ), 10 );

    add_action('sensei_before_main_content', 'my_theme_wrapper_start', 10);
    add_action('sensei_after_main_content', 'my_theme_wrapper_end', 10);

}

function my_theme_wrapper_start() {
    ttfmake_maybe_show_sidebar( 'left' );
    echo '<main id="site-main" class="site-main" role="main">';
}

function my_theme_wrapper_end() {
    echo '</main>';
    ttfmake_maybe_show_sidebar( 'right' );
}