Complex sentence: Nick begins to date Natasha Blakeman (Rachel Leskovac) they rent a flat and he gets her pregnant to his delight but has a fling with Leanne but she ends it upsetting him.
Split into simpler sentences: Nick begins to date Natasha Blakeman (Rachel Leskovac) and they rent a flat. He also has a fling with Leanne but she ends it upsetting him.