Complex sentence: Richard M. Nixon lived in Spring Valley before becoming President as did his immediate predecessor, Lyndon Baines Johnson, before becoming Vice President under John F. Kennedy, while he was Majority Leader in the U.S. House of Representatives.
Split into simpler sentences: Richard M. Nixon lived in Spring Valley before becoming President. Not only did Nixon live in Spring Valley before his White House tenure, but so did his immediate predecessor, Lyndon Baines Johnson, before becoming both President and Vice President under John F. Kennedy, while he was Majority Leader in the U.S. House of Representatives.