Complex sentence: Under Alaska Ballot Measure 2 in 1998, however, same-sex marriage was been illegal in Alaska, until same-sex marriage was authorised by the courts on 12-Oct-2014.
Split into simpler sentences: Under Alaska Ballot Measure 2 in 1998, however, same-sex marriage was illegal in Alaska at that time. Same-sex marriage was, however, authorised by the courts on 12-Oct-2014.