Complex sentence: Cramer represented Florida's 1st congressional district from 1955 to 1963, at which time reapportionment placed him in the 12th district from 1963 to 1967.
Split into simpler sentences: Cramer represented Florida's 1st congressional district from 1955 to 1963. Reapportionment placed him in the 12th district from 1963 to 1967.