Complex sentence: According to Trump, Comey requested the dinner so as to ask to keep his job and, when asked, told Trump that he was not under investigation, also adding that he did not ask Comey to pledge his loyalty.
Split into simpler sentences: According to Trump, Comey requested the dinner so as to ask to keep his job and, when asked, told Trump that he was not under investigation. Trump has stated that he did not ask Comey to pledge his loyalty.