Complex sentence: By 17 February the Government abandoned attempts to reopen the Mekong supply line, in future all supplies for Phnom Penh would now have to come in by air to Pochentong Airport.
Split into simpler sentences: By 17 February the Government abandoned attempts to reopen the Mekong supply line. In future all supplies for Phnom Penh would have to come in by air to Pochentong Airport.