Complex sentence: Outdoors, she improved her 100 metres best from 11.51 to 11.36 in the heats of the British Championships and went on to finish second in the final in 11.43.
Split into simpler sentences: Outdoors, she improved her 100 metres best from 11.51 to 11.36, in the heats of the Briish Championships. She went on to finish second in the final in 11.43.