Finding the perfect synonym for the phrase "it was consequently difficult for them to put together" can be a challenging task. Some alternatives that could be considered include "therefore proving arduous for them to assemble," "thus making it challenging to piece together," or "resulting in a difficulty for them to construct." Other possible synonyms may include "subsequently posing a challenge for them to fit together," "causing difficulty in assembling," or "leading to a complicated process of construction." Ultimately, choosing the right synonym depends on the context and tone of the writing, as well as the level of specificity required to convey the intended meaning.