Complex sentence: Running towards her he explains his actions (albeit unconvincingly), and learns that Jordana has broken up with her new boyfriend, but leaves Jordana, who has a wholly negative attitude to him because of his neglect to her, unimpressed.
Split into simpler sentences: Running towards her he explains his actions (albeit unconvincingly), and learns that Jordana has broken up with her new boyfriend. But Oliver's explainations leave Jordana, who has a wholly negative attitude to him because of his neglect to her, unimpressed.