Complex sentence: Suspicion was soon raised of a deal for Hoffa's release connected with the IBT's support of Nixon in 1972; this was later confirmed, as a large sum of money, estimated to be as high as $1 million, was paid secretly to Nixon.
Split into simpler sentences: Suspicion was soon raised of a deal for Hoffa's release connected with the IBT's support of Nixon in 1972. Is was alleged that a large sum of money, estimated to be as high as $1 million, was paid secretly to Nixon.