Complex sentence: Promoted to full admiral on 24 May 1901, Seymour arrived back at Portsmouth where he was welcomed by thousands of people lining the beach and pier and honoured by a visit by the Lords of the Admiralty to his flagship.
Split into simpler sentences: Promoted to full admiral on 24 May 1901, Seymour arrived back at Portsmouth where he was welcomed by thousands of people lining the beach and pier. Seymour was honoured by a visit by the Lords of the Admiralty to his flagship.