Complex sentence: Under his continued leadership, the Scottish Liberal Democrats' popularity grew steadily, and after he led the party through the second Holyrood elections in 2003 elections-again winning 17 MSPs but with a higher share of the vote, and again entering a coalition with Labour.
Split into simpler sentences: Under his continued leadership, the Scottish Liberal Democrats' popularity grew steadily. After leading the party through the second Holyrood elections in 2003 elections, again winning 17 MSPs but with a higher share of the vote, he led the party into a second coalition with Labour.