The phrase "again entered into" is correct and usable in written English.
It can be used when referring to re-engaging or re-establishing a relationship, agreement, or situation that was previously in place.
Example: "After much discussion, the two parties again entered into negotiations to resolve their differences."
Alternatives: "re-entered" or "resumed".
"We've once again entered into the eternal battle between quarterback chic and quarterback geek," said Mark Kriegel, the author of "Namath: A Biography" and a columnist for foxsports.com.com
Against Walpole's wishes, but to George's delight, Britain once again entered into war, the War of Jenkins Earr, with Spain in 1739.
The remaining items were again entered into PCA.
These residual values were again entered into a second-level one sample t test in SPM8 with a significance threshold of P < 0.001 uncorrected and a cluster extent of at least 10 voxels.
After the SWBOOT run, the resulting validated candidate independent variables that were selected at least 50 times out of the 100 separate models were included in the final model and again entered into a stepwise linear regression model.
Possible predictor variables were, again, entered into a forwards multiple linear regression on the basis of a univariate relationship with a p value of less than 0.2 (see Table 2); gender, smoking status, current drug misuse, duration of illness, depression (CDSS), positive symptoms (PANSS), negative symptoms (PANSS), general psychopathology score (PANSS), BMI, adherence rating and DAI score.
So again entering into the collaborating factor, I didn't know what to expect... and he's probably thinking the same about me.
What we throw away, it will mix with water, again when we drink that water, that water again enter into the blood and obviously it will have an impact.
As we drifted farther into the water, we once again entered the coral jungle.
Yet again, Donald Trump entered into a negotiation and won big".
Categorical variables were again entered as dummies.
