Complex sentence: Such sejmiks could also hear special requests from the king if their deputy was bound by instructions not to vote on certain issues that passed on the national sejm, where the king would request the sejmik to reconsider their decision and support the national legislation.
Split into simpler sentences: Such sejmiks could also receive special requests from the king; this happened if the sejmik deputy was bound by instructions not to vote on certain issues that subsequently were voted on and passed in the national sejm. In such cases the king would request the sejmik to reconsider their decision and support the national legislation.