Complex sentence: The Baemi, or Baimoi, were a Germanic tribe who are only known by their mention in Ptolemy's "Geography"; he described them as living between the Luna forest and the Danube river.
Split into simpler sentences: The Baemi, or Baimoi, were a Germanic tribe who are only known by their mention in Ptolemy's "Geography". He described them as living between the Luna forest and the Danube river.