If the tail of the split lines always starts with a space (that should be removed), and no other lines do, then this maybe close (wrapped for posting):
perl -nle
"if(m[^\s(.*)]){$s.=$1}else{length($s)&print$s;$s=$_;next};END{print$s
+}"
file >out
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.