Complex sentence: He disappeared again in early 1948, this time for six weeks, again to Gland, but according to biographer Pierre Assouline he was accompanied by a young, married woman, with whom he was having an extra-marital affair.
Split into simpler sentences: He disappeared again in early 1948, this time for six weeks, which was spent at Gland. According to biographer Pierre Assouline, he was accompanied by a young, married woman, with whom he was having an extra-marital affair.