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\left(m^{2}-1+a\right)\left(m^{2}+1-a\right)
Rewrite -a^{2}+2a+m^{4}-1 as \left(m^{2}\right)^{2}-\left(1-a\right)^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
\left(m^{2}+a-1\right)\left(m^{2}-a+1\right)
Reorder the terms.