Split a file based on new line pattern
csplit -z -f intro_ -b '%02d.tex' sectionIntroduction_.tex '/\n/' {8}
with:
intro_: the prefix of the output file name
%02d.tex: the suffix of the output file name
sectionIntroduction_.tex the output file name
/\n/ the pattern to match
{8} the number of repeat of the pattern