Complex sentence: Starting center Greg "Stretch" Howard was ineligible due to an NCAA rule disallowing transfers to play in postseason games; without his 14 points and 10 rebounds a game, the Lobos' balanced attack withered, and Nelson was their only consistent offense.
Split into simpler sentences: Starting center Greg (Stretch) Howard was ineligible to play due to an NCAA rule disallowing transfers to play in postseason games. Without his 14 points and 10 rebounds a game, the balance of the Lobo attack withered, and Nelson was their only consistent offense.