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This (cheap) trick might work sed 's/;/ /3' file

perl -ne'chomp;@r=split/;/,$_;print join(";",@r[0..2])," $r[3]\n";' tmp/tmp.dat

The thread title asks for a sed solution. Here is one:
sed '
/^ /{H;x;s/\n */ /;$p;x;d;}
x
1d
${p;x;}
' file

Here's a pe(a)rl ;-)

perl -lne 'chomp;if($.==1){$p=$_;next}; if($_=~/^\s+(.*)$/){$p = $p." ".$1}else{print $p; $p=$_} END{print $p}' file