Complex sentence: In 1962, Thomas Gambino married the daughter of Gaetano "Tommy Brown" Lucchese, the head of the rival Lucchese crime family, which was openly received, as his father Carlo used this occasion to easer the relationship between the families.
Split into simpler sentences: In 1962, Thomas Gambino married the daughter of Gaetano "Tommy Brown" Lucchese, the head of the rival Lucchese crime family. The marriage was openly received, as his father Carlo used this occasion to ease the relationship between the families.