Complex sentence: The next day, Graf, officially remaining in command of JG 50, was appointed acting "Geschwaderkommodore" of JG 1 and transferred to Jever and Graf appointed Grislawski as acting-commander of JG 50.
Split into simpler sentences: The next day, Graf, officially remaining in command of JG 50, was appointed acting "Geschwaderkommodore" of JG 1 and transferred to Jever. Graf subsequently appointed Grislawski as acting-commander of JG 50.