Complex sentence: By 1950, trust monies left by the Booth family were insufficient for all that was needed in changed times; moreover, members of the Booth family had left the area and it was impossible for them to maintain an active status as trustees.
Split into simpler sentences: By 1950, trust monies left by the Booth family were not sufficient for all that was needed in changed times. Moreover, members of the Booth family had moved out of the area and it was impossible for them to maintain an active status as trustees.