Original sentence: Another solution is to combine the first and second rounds into a single round of so-called Instant Runoff Voting, whereby the voter lists some or all of the candidates as reserve choices should their first choice drop out due to lack of support
Edited sentence: A better solution is to combine the first and second rounds into a single round of so-called Instant Runoff Voting, whereby the voter lists some or all of the candidates as reserve choices should their first choice drop out due to lack of support