Royal Dutch Shell Plc cut spending plans further and promised increased savings following its record purchase of BG Group Plc as it continues to adjust to the slump in oil prices. Europe’s biggest energy company will spend $29 billion this year, it said Tuesday. That compares with a May forecast for capital expenditure “trending toward” $30 billion, which was down from an earlier projection of $33 billion. Synergies from the BG acquisition will provide $4.5 billion in savings in 2018, up from an earlier estimate of $3.5 billion. Chief Executive Officer Ben Van Beurden, who staked his reputation to buy BG as oil prices sank, is promising investors higher returns and cash flows at lower oil prices as he resets the company following the $54 billion acquisition. He has renegotiated contracts, eliminated thousands of jobs, maintained Shell’s asset-sale program and sought to improve efficiency to weather the oil-market slump. […]