Complex sentence: He can either call on the President to dissolve parliament and hold a snap election, he may also resign as Prime Minister and the President will be forced to seek an alternative leader who commands the support of the majority of MP's in the house.
Split into simpler sentences: He can either call on the President to dissolve parliament and hold a snap election or else resign as Prime Minister. In this case the President will be forced to seek an alternative leader who commands the support of the majority of MP's in the house.