Complex sentence: In 1964, he founded the Portuguese National Liberation Front in Rome, stating in public that the only solution to end the "Estado Novo" would be by a military coup, while many others advocated a "national uprising" approach.
Split into simpler sentences: In 1964, he founded the Portuguese National Liberation Front in Rome. While in exile, he saw that the only solution to end the "Estado Novo" would be by a military coup, while many others advocated a "national uprising" approach.