Complex sentence: Meanwhile, Merton's father was traveling and painting and attending an exhibition of his work in London, but in the summer of 1928 he took Merton out of the Lycée Ingres, informing him that they were headed together to England.
Split into simpler sentences: Meanwhile, Merton's father was traveling, painting and attending to an exhibition of his work in London. In the summer of 1928, he took Merton out of the Lycée Ingres, informing him that they were headed together to England.