Complex sentence: By 8 April, he had recovered enough to teach at Jastaschule I at Valenciennes Aerodrome until on 2 July he was given command of Jagdstaffel 29.
Split into simpler sentences: By 8 April, he had recovered enough to teach at Jastaschule I at Valenciennes Aerodrome. On 2 July, he was given command of Jagdstaffel 29.