Simplify the following text for a Grade 6 native English-speaking person.
Original: Following the sudden decline of the town 's harbor caused by the closure of the Lady Blanche Pit , the town was amalgamated into the royal burgh of Kirkcaldy under an act of parliament in 1930 .
Simplified: When the coal mine , the Lady Blanche Pit , closed suddenly use of the harbor almost stopped . The town was joined with the royal burgh of Kirkcaldy in 1930 .