Verizon Communications Inc. reached a renegotiated deal for Yahoo! Inc.’s internet properties that will reduce the price of the $4.8 billion agreement by $350 million after the revelation of security breaches at the web company, according to a person familiar with the matter. In addition to the discount, Verizon and the entity that remains of Yahoo after the deal, to be renamed Altaba Inc., will share any ongoing legal responsibilities related to the breaches, said the person, who asked not to be identified discussing private information.