(Reuters) - Clearwire Corp plans to tap financing from Sprint Nextel , in a move that further complicates Dish Network's effort to buy Clearwire, the Wall Street Journal reported, citing people familiar with the situation. Dish made an offer of $3.30 per share for the wireless broadband operator, which had already agreed to sell itself to majority owner Sprint for $2.97 per share. A special committee on the Clearwire board is reviewing the Dish offer. ...