The phrase "a further reason was" is correct and usable in written English.
It can be used when introducing an additional justification or explanation for a point being made.
Example: "The project was delayed due to unforeseen circumstances; a further reason was the lack of resources."
Alternatives: "an additional reason was" or "another reason was".
A further reason is that the Pakistani army may be expert at blowing things up, but the civilian government is not good at rebuilding them.
A further reason is to induce the unemployed to seek and accept work after benefits end or when they fall, although such work may be less well paid than the individual's earlier work and may provide an income that is lower than the unemployment benefit that has ceased.
A further reason is that Perlman and Wellner (2011), Section 6, consider the possibility to generate non-linear circular copulas and provide an example.
A further reason is that one purpose of the canonical framework is to enable us to assess the ontology of a theory.
A further reason is that, as John Finnis and Ronald Dworkin have both explained in different ways, the word 'law' can be used in a variety of senses: the law of the jungle, the law of gravity, laws of thought, Murphy's law, etc. (Finnis 1980, 6; Dworkin 1986, 104).
A further reason is its outstanding regenerative tissue plasticity raising many questions concerning tissue engineering and regeneration research [ 488].
A further reason is the option, for many Islanders, of working abroad, particularly in Australia or New Zealand, and the need for domestic governments (particularly) and industry to be modestly competitive with this option to attract skilled employees.
A further reason is the fact that it has already been revealed in the hearings that not a single one of the new European commissioners is prepared to do anything about the democratic deficit.
It is a good explanation, and there is a further reason, which is to offer yourself to posterity.
