Complex sentence: The issues of Rohingya refugees also test Malaysia's chairmanship on ASEAN as previously Malaysia together with Indonesia and Thailand rejecting boats carrying Rohingya asylum seekers from reaching their shores mainly due to domestic concerns on illegal immigrants.
Split into simpler sentences: The issues of Rohingya refugees also test Malaysia's chairmanship on ASEAN. Previously, Malaysia together with Indonesia and Thailand rejecting boats carrying Rohingya asylum seekers to reach their shore due to domestic concerns on illegal immigrants.