Another clunky sentence

[Richard Hargreaves]

which I can't unclunk.

Hierzu trugen neben einer eher diffusen Furcht vor einem Grossangriff jene April-Bombardements bei, die - kaum war der Schrecken über den März-Angriff halbwegs verfolgen - bereits wieder "alle bisherigen in den Schatten stellten".

Help appreciated.

[l3w]

Apart from a rather vague fear of major offensives it* was above all due to the April bombings, which again - as soon as the terror of the March attack had subsided - overshadowed all previous bombings.

*'it' is a reference to the previous sentence.

[Richard Hargreaves]

Many thanks.

That makes perfect sense in context.