Complex sentence: Rottman, Gordon L. p.4-5 However, it was not sufficient against Soviet T-34 and KV-1 tanks, and phased out in favour of shorter 7.5 cm KwK 37 L/24 gun that could fire HEAT rounds.
Split into simpler sentences: Rottman, Gordon L. p.4-5 However, it was not sufficient against Soviet T-34 and KV-1 tanks. Rottman says, that for this reason it was phased out in favour of shorter 7.5 cm KwK 37 L/24 gun that could fire HEAT rounds.