Complex sentence: The Philippines motive to intervene was questioned by the Court, as whether the Philippines had a "sufficiently strong legal interest" with both Indonesia and Malaysia strongly rejected the Philippines attempt of intervention, citing it did not relate to the subject matter of the case.
Split into simpler sentences: The Philippines motive to intervene was questioned by the Court, as to whether the Philippines had a "sufficiently strong legal interest" with both Indonesia and Malaysia. The court strongly rejected the Philippines attempt of intervention and in doing so cited that the request made by the Phillipines did not relate to the subject matter of the case.