Reading a file divided in block and inside each block the data contained is non-homogeneous in format not in amount of elements to be read

Hello I have to read a huge file with data divided in blocks. For many of them I can use textscan because the number of elements is constant but there are two blocks that I do not know how to read. One of those problematic block are of the form

608751 0 'pepito' -1.5 2.3 123 0.25 456 0.75

            4.5 78.9 'fulanito'

645671 0 'cucu' -1.5 2.3 123 0.25 12 1

            1.5 8.9 'zutanito'

The secon line with two data correspond to the information of book in the previous line. How can I read these kind of data. Moreover if the second component of the first line is different from 0 I have more data to read. How can I do it?

I have proved using fscanf and it didn't work, or I didn't know how to do it.

Thank you