1.)
Original:
Moreover, citing relevant objective sources was fundamental to the successful completion of the proposal.
Paraphrase:
, the proposal was completed successfully using referencing of appropriate as its basis.

2.)
Original:
There was insufficient funding, hence the collation of crucial data as we concluded the project was delayed.
Paraphrase:
The of essential at the conclusion of the project was subject to delay, due to inadequate support.

3.)
Original:
Not all the participants amended the principle features of the schedule, thus the eventual outcome became less definite.
Paraphrase:
The of the were not revised by all those participating, the final was not certain.