The multiple-word clues don't get separated. I found it easiest in this particular crossword to start with the 6 8-letter answers, which were among the easier ones, and work out which of them had a fourth letter that could be the beginning of a 10-letter clue and a final letter that could be the beginning of a 5-letter clue. Once I'd got that one in, I was able to start fitting a few more in.