以来 => since; henceforth ~ N2
過去形 => Past form N5
Conjugate verbs
に過ぎない => no more than; just; merely; only ~ N2
て[以来「いらい」] => After A, B (continuous action/condition N2
Information, Report
に行く/に来る/に帰る => go/arrive/go back (to do something) N5
~といっても言い過ぎではない => it is no exaggeration to say; it is not too much to say N1
Position, perspective
へ => Go to N, head to N , Often followed by verbs like 行く/いく, 来る/くる, 向かう/むかう… N5
Particles