Complex sentence: Tall and blond, on occasion he dyed his hair black and, disguised as a female nurse, took photographs of Amsterdam documenting the German occupation; such photographs were used, besides as documentary evidence, to strengthen morale and raise funds for resistance activities.
Split into simpler sentences: Tall and blond, on occasion he dyed his hair black and, disguised as a female nurse, took photographs of Amsterdam documenting the German occupation. These photographs were used, as documentary evidence of the occupstion, and to strengthen morale and raise funds for resistance activities.