Try to improve the parse on a runaway sentence

results.tex

@@ -55,9 +55,10 @@ a Haswell implementation that is significantly faster than the others.
 
 \subheading{The cost of completeness.}
 Another question we might be able to answer is if the factor-$1.4$ penalty
-claimed in~\cite{RCB16} for complete formulas vs.\ incomplete formulas
+claimed in~\cite{RCB16}---for complete formulas vs.\ incomplete formulas---%
 % On versus as 'vs.': https://english.stackexchange.com/a/5395
-on the same Weierstraß curve is realistic also
+% on the same Weierstraß curve
+is realistic also
 for optimized implementations.
 
 In~\cite{BCLN16}, Bos, Costello, Longa, and Naehrig present performance results