Original: Lennon and Ono were having marital problems and decided to separate, and Ono suggested to Pang that she become Lennon's companion. Ono explained that she and Lennon were not getting along, had been arguing and were growing apart, and said that Lennon would start seeing other women.
Simplified: Lennon and Ono decided to reconcile early in 1975, and became the parents of Sean Lennon.