Splitting up visual blocks of text in java -

i have block of text i'm trying interpret in java (or grep/awk/etc) looking following:

   differently, plaques of rn8 , rn9 mutants            , human coronavirus oc43 more divergent    of wild-type size, indicating suppressor mu-    sars-cov, human coronavirus hku1, , bat coronaviruses    tations, in isolation, not noticeably deleterious       hku4, hku5, , hku9 (fig. 6b). thus, not mem-    --    able effect on viral phenotype. potentially related obser-    sented existence of interaction between nsp9    vation mutation a2u, neutral itself,   nsp8 (56). hexadecameric complex of sars-cov nsp8 ,    lethal in combination aacaag insertion (data not        nsp7 has been found bind double-stranded rna. 

and i'd split 2 parts: left , right. i'm having trouble coming regex or other method split block of text visually split, not obvious programming language. lengths of lines variable.

i've considered looking first block , finding second looking multiple spaces, i'm not sure that's robust solution. ideas, snippets, pseudo code, links, etc?

text source

the text has been ran follows through pdftotext pdftotext -layout mypdf.pdf

blur text , come array of character density per column of text. gaps , split there.

string blurredtext = text.replaceall("(?<=\\s) (?=\\s)", "."); string[] blurredlines = text.split("\r\n?|\n");  int maxrowlength = 0; (string blurredline : blurredlines) {   maxrowlength = math.max(maxrowlength, blurredline.length()); }  int[] columncounts = new int[maxrowlength]; (string blurredline : blurredlines) {   (int = 0, n = blurredline.length(); < n; ++i) {     if (blurredline.charat(i) != ' ') { ++columncounts[i]; }    } }      // runs of 0 of @ least length 3. // alternatively, might n longest runs of zeros. // alternatively, might runs of length min(columncounts) ignore // horizontal rules.  int minbreaklen = 3;  // tuning parameter. list<integer> breaks = new arraylist<integer>(); outer: (int = 0; < maxrowlength - minbreaklen; ++i) {   if (columncounts[i] != 0) { continue; }   int runlength = 1;   while (i + runlength < maxrowlength && 0 == columncounts[i + runlength]) {     ++runlength;   }   if (runlength >= minbreaklen) {     breaks.add(i);   }   += runlength - 1; }  system.out.println(breaks);