I can think of two approaches that might work to varying degrees, but you'd have to experiment to see.
1. Put both lines it in the same paragraph and shift the second one down with a baseline shift. Caveat: if it ends up wrapping to the next line, that will obviously look less than ideal.
2. Use a table whose width is set to the width of the browser screen, with two rows and two columns. Caveat: not all readers handle tables very well.
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