换成主动句以后的顺序是：People generally considere Tim who has founded the world wide web.
或People generally considere that Tim has founded the world wide web.
或People generally considere Tim has founded the world wide web.
3个句子都成立的,因此to have founded the world wide web在句子中的成分应当是宾语补语.
区分双宾语还是宾语补语的关键是看动作是主语做的,还是宾语做的.主语做的就是双宾语,宾语做得就是宾语补语.