You need the context of what he said before that. He wasn't talking about his return he was talking about specific signs.
The problem with a lot of the Bible is that it is too easy to misinterpret. Its why biblical scholars exist.
Hell so much of it even requires historical context.
But for this specifically you jumped to the end of a long speech Jesus gave and ignored the body of it. And I don't blame you. It's easy to get lost in such a dull and antiquated collection of books.
It's why Young Earth Creationists think there are references to dinosaurs in the Old Testament. Lack of paying attention to a hard to follow text
But yes he was talking about the rise of Christianity and specific things that would come with it. Not his second coming.
Republicans own this