By Reuters Staff 2 Min Read April 15 (Reuters) - Shares of Dell rose nearly 8% in premarket on Thursday, a day after the PC maker said it would spin off its majority stake in cloud computing software maker VMware, which would trim down its business and make the firm nimbler. The spinoff of its 81% stake in VMware, first proposed in a filing last July, would also help Dell lower its long-term debt of $41.62 billion, much of which was taken on during its 2016 acquisition of data management firm EMC. Wall street analysts saw benefits in the spinoff, but some also raised long-term concerns about company’s core business.