Complex sentence: The lead Indiana case on same-sex marriage is "Baskin v. Bogan", filed in the Southern District of Indiana by Lambda Legal on behalf on three same-sex couples, all women.
Split into simpler sentences: The lead Indiana case on same-sex marriage is "Baskin v. Bogan", filed by Lambda Legal in the Southern District of Indiana. The lawsuit was brought on behalf on three same-sex couples, all women.