Lewis Hamilton has provided some further insight into why he decided to split with his long-time physiotherapist Angela Cullen. The pair have worked together for the last seven years, with Cullen being a key part of Hamilton's orbit on his way to seven World Championships. Mercedes boss Toto Wolff revealed that it was Hamilton who decided to part ways with her after the Saudi Arabian Grand Prix , with the Briton elaborating on the split. "Me and Angela are good and she's moving on to a different phase of her life," said Hamilton to media, including RacingNews365.com . "We're still…