Complex sentence: All 10-year members of the BBWAA were eligible to participate by voting for as many as 10 candidates; any candidate receiving votes on at least 75% of the ballots returned would be honored with induction to the Hall.
Split into simpler sentences: All 10-year members of the BBWAA were eligible to vote. Voters were instructed to cast votes for up to 10 candidates; any candidate receiving votes on at least 75% of the ballots would be honored with induction to the Hall.