Complex sentence: Chemical maker Basell Polyolefins purchased Lyondell on Thursday, 20 December 2007, creating the new company LyondellBasell Industries AF S.C.A. Basell Polyolefins is owned by Access Industries, a privately held, U.S.-based industrial group.
Split into simpler sentences: Chemical maker Basell Polyolefins purchased Lyondell on Thursday, 20 December 2007, creating the new company LyondellBasell Industries AF S.C.A. Basell Polyolefins. It was owned by Access Industries, a privately held, U.S.-based industrial group.