(Reuters) - Hedge fund Third Point LLC amassed a more than $2 billion stake in Prudential Plc (PRU.L) and called on the British insurer on Monday to split into two companies. Third Point’s demands, first reported by Reuters earlier on Monday, could lead to a major shake-up at Prudential, only a few months after it spun out its European insurance and asset management businesses into a new company called M&G Plc (MNG.L).