En japonais il y a un mélange de kanji (行) et de caractères simples ( と も etc). Alors qu'en chinois il n'y a que des kanji. Et en coreen il y a des ovales (호).

As Iman has said, there are no blanks. In the beginning that was also difficult for me (in addition to reading Kanji + Hiragana), so I transcribed sentences into latin letters with spaces (and then analyzed them for grammar). If you keep practicing like this or similarly, eventually you'll be able to seperate the words in your mind. Many Japanese words start with a Kanji and end with an inflection ending in Hiragana, so that can help. There's also a plugin called Rikaichan/Rikaikun that you can use in your webbrowser to look up words; it will identify words of different length including the inflection ending, which makes it easier to seperate the sentence. In the end, you need to recognize all the words properly before you can seperate them. So you'll need to build up your vocabulary before you can do that. It takes time and effort...