Complex sentence: After diplomatic pressure and negotiations on 3--4 April led nowhere, the UK government, led by the Prime Minister, Margaret Thatcher, decided to re-take the islands, and deployed a combined army and naval task force to do so.
Split into simpler sentences: After diplomatic pressure and negotiations on 3--4 April led nowhere, the UK government, led by the Prime Minister, Margaret Thatcher, determined to re-take the islands. They deployed a combined army and naval task force to do so.