[css-inline-3] Simplify sentence's grammatical structure.

Author: fantasai

css-inline-3/Overview.bs

@@ -1103,11 +1103,11 @@ Logical Height Contributions of Inline Boxes</h3>
 	(for the given font at its given size)
 	and <var>D</var> to the [=descent metric=],
 	each adjusted to account for the [=dominant baseline=]’s offset from zero.
-	If 'line-height' computes to ''line-height/normal'',
+	If 'line-height' computes to ''line-height/normal''
+	and 'text-edge' is ''text-edge/leading'',
 	the font’s [=line gap metric=]
 	may also be incorporated into <var>A</var> and <var>D</var>
-	by adding half to each side
-	when 'text-edge' is ''text-edge/leading''.
+	by adding half to each side.
 
 	When its computed 'line-height' is ''line-height/normal'',
 	the [=layout bounds=] of an inline box encloses all its glyphs,