An user German
says…

Ausschlaggebend
Adjective
  dürfte
Auxiliary
  die
Determiner
  zu
Adverb
  geringe
Adjective
  Ausbeute
Noun
  gewesen
Auxiliary
  sein
Auxiliary
.

The too low yield is likely to have been decisive.
Words and sentences
New
ausschlaggebend

decisive, crucial

New
dürfte

first/third-person singular subjunctive II of dürfen

New
die

New
zu

New
geringe

  1. inflection of gering:
  2. inflection of gering:
  3. inflection of gering:
  4. inflection of gering:

New
Ausbeute

  1. yield, gain(s) (of a hobby, occupation, etc)
  2. yield (of the end product of a chemical reaction)

New
gewesen

New
sein

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