Complex sentence: The Islanders selected Ferguson from the Seals on June 6,1972 in the expansion draft but Ferguson had signed a contract on April 1st to play with the WHA New York Raiders for the 1972-1973 season.
Split into simpler sentences: The Islanders selected Ferguson from the Seals on June 6,1972 in the expansion draft. Rather than sign with the Islanders, Ferguson jumped to the WHA New York Raiders for the 1972-1973 season.