Complex sentence: Khagan Theodorus, a convert to Christianity, died after asking Charlemagne for help in 805 and was succeeded by Khagan Abraham who was baptised as the new Frankish Client and should not be assumed from his name alone to have been Kavar rather than Pseudo-Avar.
Split into simpler sentences: Khagan Theodorus, a convert to Christianity, died after asking Charlemagne for help in 805 and was succeeded by Khagan Abraham who was baptised as the new Frankish Client. Like Theodore, Abraham was also baptised and should not be assumed from his name alone to have been Kavar rather than Pseudo-Avar.