と同時に => at the same time as; while; simultaneously ~ N2
~助詞+数量      => Corresponds to the verb...of quantity N5
Quantity
も同然 => just like; same as ~ N2
[時「とき」] => At the time A N5
Time
[続「つづ」]ける => continues, to continue to N4
Secondary Verb
続ける => to continue; to keep up; to keep on. N4
Vた[時「とき」] => After having done something N5
Time
~もどうぜんだ(~も同然だ)      => just like; same as ~ N1
も[同然「どうぜん」]だ => The same as saying A, as good as A N2
Adjectival, Descriptions